15. He was reading his book, completely _______ to the world.
A. lost B. losing
C. to lose D. to have lost
答案请看第4页
16. We looked everywhere for the keys, but they are nowhere _______.
A. to find B. to have found
C. to be found D. being found
17. The boy wanted to ride his bicycle in the street, but his mother told him _______.
A. not to B. not to do
C. not do it D. do not do
18. A cook will be immediately fired if he is found _______ in the kitchen.
A. smoke B. smoking
C. to smoke D. smoked
19. Finding her car stolen, _______.
A. a policeman was asked to help
B. the area was searching thoroughly
C. it was looked for everywhere
D. she hurried to a policeman for help
20. How do you deal with the disagreement between the company and the customers? The key ______ the problem is to meet the demand ______ by the customers.
A. to solving, making B. to solving, made
C. to solve, making D. to solve, made
21. What do you think made Mary so upset? _______ her new bike.
A. As she lost B. Lost
C. Losing D. Because of losing
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