Optional test (Have you brought my umbrella?)

[Nessie]

1/ By cutting down the trees, we ... the natural habitat of birds and animals

a. damage
b. harm
c. injure
d. hurt

2/ Have you brought my umbrella?

- Oh no! I ... again. That's stupid of me
a. forget
b. forgot
c. have forgotten
d. had forgotten
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... something we never have again, I know... I guess I really really know..

Sorry seems to be the hardest word...

[Mister Micawber]

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What are your choices and why?
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Native English teacher at Mister Micawber's

[Nessie]

For the first question, I can't give the exact answer because the two words "damage" and "harm" have so similar meanings (according to my OALD) => confused!!??!!

For the second question, I choose "have forgotten" because I think the fact that "I" forget to take the umbrella has already happened. However, my teacher said that "forgot" is the right answer here, so I want to see about ideas of some native speakers
_________________
... something we never have again, I know... I guess I really really know..

Sorry seems to be the hardest word...

[Mister Micawber]

.
1-- 'Damage' is the answer; 'harm' I suppose is also possible, but we more often use 'harm' of non-physical damage and it also often includes the idea of pain or defacement.

2-- Both B and C will work. B, I think, is more common.
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Native English teacher at Mister Micawber's