How are compound words used?

[Elly]

English Language Tests, Intermediate level

ESL/EFL Test #235 "Phrasal verbs and traveling", question 9

We drove to Canada this past summer. We had to ......... four times on the way. We got pretty good gas mileage.

(a) fill out
(b) ran out
(c) fill up
(d) fill in

English Language Tests, Intermediate level

ESL/EFL Test #235 "Phrasal verbs and traveling", answer 9

We drove to Canada this past summer. We had to fill up four times on the way. We got pretty good gas mileage.

Correct answer: (c) fill up

Your answer was: incorrect
We drove to Canada this past summer. We had to fill in four times on the way. We got pretty good gas mileage.
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how are compound words used?

Elly

[Alan]

Hi,

If you go the part of this site headed esl lessons, you will see some material I have written using these phrasal verbs starting with this one:

ESL Lesson / Phrasal verb break
http://www.english-test.net/lessons/53/index.html

Alan
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English as a Second Language
You can read my ESL story A spring in your step