— It _______ be Jack who is in the office.
— No, it _______ be him. I saw him off at the airport half an hour ago.
| A．can’t ; can’t | B．must; can’t |
| C．must; mustn’t | D．may; mustn’t |
______ some teenagers don’t realize is ________ difficult life can be after they get addicted to drugs.
| A．What; how | B．That; how | C．That; what | D．What; what a |
—I saw your uncle take a taxi to the airport. Why didn’t you drive him there?
—I __________. But my car ___________ .
| A．would; was fixed | B．would have; was fixed |
| C．would have; was being fixed | D．did; was being fixed |
_____ an important decision more on emotion than on reason, you will regret it sooner or later.
| A．Based | B．Basing | C．Base | D．To base |
We met an old friend in New York ________our expectation. She waved at us _______ the street when she saw us.
| A．with; in | B．out of; next to |
| C．in; out of | D．beyond; from across |
The factory was built in a secret place, around ________ high mountains.
| A．which was | B．it was | C．them were | D．which were |