The professor could not understand _____ most of the students ...

[ Grammar for TOEFL ]

The professor could not understand _____ most of the students failed the exam despite the fact that the material had been thoroughly discussed in class and additional study sessions were provided.

A. why

B. if they were paying attention during the lectures,

C. while he was explaining the difficult parts,

D. because they seemed well-prepared during the review,

Select your answer:
A B C D E

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My scores in high school _________ ________ ___________ until I made an effort to study more.

A. couldn’t be improved

B. hadn’t been improving

C. haven’t been improving

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I…(live)…without electricity for two weeks.

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I’m fed up with this terrible weather — it’s so … .

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In the example below, what is the coordinate conjunction joining?

Tom will bring the chairs, or Mary can get them from the closet.

A. words

B. phrases

C. sentences/ clauses