21. the boss ______ company i worked in two years ago has _________ in solving such kind of problem.
a. whose; many experiences b. who; many experiences
c. whose; much experience d. which; much experience
22. according to a recent survey, children spent up to 25 hours a week _____ tv.
a. to watch b. to watching c. watching d. watch
23. he used to ______ cards, but now he is used to _______ a walk after supper.
a. play; taking b. playing; take c. play; take d. playing; taking
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