19. when the teacher came in, the naughty boy ____________ a comic book.
a. happened to read b. happened to have read c. happened to be reading d. happened to reading
20. ____________ seems strange to us is that he should have been fired for smoking on work.
a. what b. it c. whether d. that
21. be careful when drinking for when wine goes in the secret _____________.
a. comes in b. comes up c. comes over d. comes out
22. it’s really great to have you here as our guest. can't you _____________ your visit for a few days?
a. expand b. extend c. delay d. enlarge
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