---- Really? It _____ be a fire, most probably.
A. can B. ought to C. have to D. must
17. If you don't wait _______ the red light, you will be punished by the policeman.
A. at B. under C. for D. on
18. ________ doesn't seem to have been much difficulty in solving the problem.
A. It B. That C. There D. He
19. Are the parents who let their child who is ______ walk in the dark alone at night considerate?
A. young enough B. too young to C. not old enough to D. so young
20. If you want to sell your product you must _____ it.
A. advertise B. advertise for C. advertise on D. advertise to
21. ----Any news about Bill Clinton?
----He left power three years ago and has a little now and a little then been ______.
A. heard of since B. heard since C. heard before D. heard of before
22. Professor Liu has ________ teach psychology since he came to the Central China Normal University.
A. determination to B. been determined to C. been determining to D. determined to
23. The idea for the new machine came to Mr. Baker ______ to his invention recently.
A. while devoting B. while devoted C. while he was devoted D. while devoting himself.
24. How many of us ______ a meeting that is not important to us would be interested in the discussion?
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