15. It is difficult for us to learn a lesson in life ____we’ve actually had that lesson.
A. until B. after C. since D. when
14. The report about the ______ surprised all the ______.
A. present situation; people present B. present situation; present people
C. situation present; people who present D. situation present; presented people
13. The man kept silent in the room unless _______.
A. spoken B. speaking C. to speak D. spoken to
12. ______ writing the article, Mrs. Curie even forgot her dinner.
A. Absorbed in B. Absorbing at C. Having absorbed by D. To absorb in
11. The man is being questioned in relation to the ______ murder last night.
A. advised B. attended C. attempted D. admitted
10. -----Can you tell us what is important to a businessman?
-----________ information.
A. Collect B. Collected C. Having collected D. Collecting
9.The professor referred to yesterday.
A. come B. came C. coming D. comes
8. -----What about the protection?
-----Let’s keep the surface ____ dirt by putting a cover over it.
A. far from B. free from C. apart from D. away from
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