-- ________ your homework yet?
-- Not yet. I _______ it.
A. Have you done; am doing B. Did you do; am doing
C. Have you done; did D. Did you do; did
-- Did you read a book about customs last week?
-- Yes, I found ______ very useful to know the customs of foreign countries.
A. that B. this C. it’s D. it
--You used to be quiet, ____you？
--Yes, and I used to be very shy.
A. wasn’t B. didn’t C. aren’t D. haven’t
-- How do you study a test?
-- I study listening to tapes.
A. to; by B. by; with C. for; by D. with; for
--What’s the matter?
--They said I shouldn’t be allowed here. They don’t allow in the waiting room.
A. smoking; to smoke B. to smoke; smoke
C. to smoke; smoking D. smoking; smoking
--Listen! Tom is singing in the next room.
--It _______ be Tom. He has gone to Shanghai.
A. may B. must C. mustn’t D. can’t
