Question

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高1英語です。
（2）、（4）がなぜこのような回答になるのか教えて頂きたいです。

(1) I_ was able to
(2) Some people say fashion
(3) Takuya
can
can
(4) Elephants
study at an American University
分割する
repeats itself. They may be
speak
Chinese
[ can / may / was able to]
right.
[ are able to be / may have been / may be ]
well. He has been studying it for five years.
sometimes be dangerous.
[may / was able to / can ]
[ can / should / wouldn't ]