18. It is suggested that Mars rocks even at high temperatures.
A. are unlikely to be melted
B. should be unlikely to be melted
C. is unlikely to be melted
D. be unlikely melted
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17._____these pictures,I couldn’t help thinking of those days when I was in Beijng.
A. looking at
B. looked at
C. to be looking at
D. to look at
16. The number of people _____ fifty, but many of them absent for different reasons.
A. were, was
B. was, was
C. was, were
D. were, were
15. She knows some of the people have died from the accident.
A. where
B. which
C. who
D. whom
14. my opinion, the essay is supposed to be handed in tomorrow.
A. from
B. in
C. on
D. to