单选题 I don’t doubt _________the stock market will recover from the economic crisis.

单选题 For years,doctors ___________millions of patients’ lives with the help of microscopes.

单选题 There are two maps on the wall:one is a map of China,and ___________ is a map of the world.

单选题 News came from the sales manager _________the new product had been selling well in the local market for three months.

单选题 — Your English is quite good.—________

单选题 According to a recent report,( ) that Americans consume does not vary greatly from year to year.

单选题 The plane is( )to take off at 4.

单选题 If you ( ) that late movie last night, you wouldn’t be sleepy now.