Give me answers and explanations about some TOEIC questions

[onetruelove]

3. The earth is the only planet with a large number
of oxygen in its atmosphere.

4. Robert Frost was not well known as a poet until he reached the forties.

15. A rabbit moves about by hopping on its hind legs, which are much longer and more strong than its front legs.

17. The grape is the ___________ , juicy fruit of a woody vine.
(A) skin
(B) which is smooth
(C) smooth skin
(D) smooth-skinned

21. In her writing, Elimor Wylie often dealt with her own personality as it was, rather than _________ .
(A) as was defines by others
(B) its definitions by others
(C) other's definition
(D) as others defined it

23. Essentially, a theory is an abstract, symbolic representation of _____________ reality.
(A) what is conceived
(B) what it is conceived
(C) what is conceived to be
(D) what is being conceived

I will take the toeic exam soon. I download 870 questions to pratise but don't understand some. So I need the correct answers and explantions

Thank you

[Yankee]

Hi onetruelove

I've noted correct answers in blue. (In the first three questions, I left the incorrect answers in the sentence, but I made them red.)

Now that you have the corrections, can you think of the reasons?

[onetruelove]

Thank you yankee very much. And i have some more questions to ask :

27. Approximately one-third of all persons involved in adult education programs in 1970 were enrolled in occupational education course.

28. As a glacier melts, rocks, boulders, trees, and tons of dirt deposit.

33. Some nematodes are very tiny that it Is necessary to view them through a microscope.

28. Natural adhesives are primarily of animals or vegetable origin.

[Yankee]

Hi onetruelove

So, can I assume that you understood the reasons for the last changes?

Amy

[berione81]

Hi onetruelove,

can I learn the address which you download the practice questions? I also want to practise too.Thanks

[onetruelove]

Dear berione81: I don't remember where i downloaded it but i can you this word file. Just send me your email address.

Dear Yankee,
I'm sorry i'm so busy this time so i can't reply. I appreciated your help very much. Thanks a lot.
Your answers help me a lot and i understand it quite well.

Can i ask you a few more questions:

61. The spontaneity of children's artwork sets it apart from the regulated uniforming of much of what
otherwise go on in traditional extraordinary classrooms.

64. Bone and ivory needles found at archaeological sites indicate that clothes have been sewn for some
17,000 years ago.

65. The sun seems to have been formed when the universe was already 10 billion years.

69. Even the most discriminating gourmet will agree that food in the south is as good as any other
region in the country.
70. In her writing, Elinor Wylie, often dealt with her own responsibility as it was, rater than _______ .
(A) as others defined it
(B) other's definitions
(C) its definition by others
(D) it was defined by others

74. With the start for the penny papers in the 1830's, the number of people _________
a newspaper rose considerably.
(A) regularly reading
(B) were reading regularly
(C) regularly reading what
(D) who reading regularly

78. At present production levels, _________ deposits of bauxite can provide the world with aluminum for hundreds of years.
(A) known
(B) known are
(C) they are known
(D) what is known

80. The office manager insists that his staff use all of its vacation time, but he hardly never takes a
vacation himself.

81. Life insurance, before available only to young, healthy persons, can now be obtained for old people
and even for pets.

[prezbucky]

61. The spontaneity of children's artwork sets it apart from the regulated uniformity of much of what
otherwise goes on in traditional extraordinary classrooms.

note: "extraordinary" should be omitted. "Regulated" might seem redundant to some.

64. Bone and ivory needles found at archaeological sites indicate that clothes have been sewn for some
17,000 years.

65. The sun seems to have been formed when the universe was already 10 billion years old.

69. Even the most discriminating gourmet will agree that food in the South is as good as it is in any other
region of the country.

70. In her writing, Elinor Wylie often dealt with her own responsibility as it was, rather than _______ .
(A) as others defined it
(B) other's definitions
(C) its definition by others
(D) it was defined by others

A is correct. However, "as it was" implies fact rather than opinion. Therefore, I'd say "...as she defined it, rather than as others defined it." or "...as she saw it, rather than as others defined it."

I'd like to know what is meant by "...dealt with her own responsibility as it was".

74. With the start of the penny papers in the 1830s (no apostrophe -- you would not write "thirtie's"), the number of people _________ a newspaper rose considerably.
(A) regularly reading
(B) were reading regularly
(C) regularly reading what
(D) who reading regularly

A is best.

78. At present production levels, _________ deposits of bauxite can provide the world with aluminum for hundreds of years.
(A) known
(B) known are
(C) they are known
(D) what is known

A is correct. However, it would be better to say "...levels, there is enough bauxite to provide the world with aluminum for hundreds of years."

80. The office manager insists that his staff uses all of its vacation time, but he hardly ever takes a
vacation himself.

note: "though" or "while" would be better than "but". Also, "staff" might be viewed by some as being plural (watch an English soccer show and you'll immediately know what I mean). If you were to treat it as plural, you'd subsequently write "use" and "their".

81. Life insurance, previously available only to young, healthy persons, can now be obtained by old people
and even by/for pets. (Well, pets themselves would not take out a policy... so maybe in that case it's better to use "for pets".)
_________________
Billie Jean is not my lover. Hee.