Only when he had handed in his exam paper he had made several mistakes.
A. he has realized
B. does he realize
C. has he realized
D. did he realize
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The party the students looked forward to yesterday afternoon.
A. was held
B. being held
C. was to be held
D. was being held
If you hadn’t told me about it, I unaware of the facts now.
A. would still have been
B. am still
C. would still be
D. was still
The universe is made of different kinds of .
A. matter
B. men
C. life
D. thing
We want such materials________ can bear high temperature and pressure.
A. that
B. as
C. what
D. which