_____ human beings live in great numbers, the waters are very likely to become contaminated.
| A．That | B．Where | C．Even if | D．Though |
The new station being built for the next Asian Games will bethe present one.
| A．as three times big as | B．three times as big as |
| C．as big as three times | D．as big three times as |
The ________ expression on her face suggested that she _________ the _________ physics problem.
| A．puzzling；was puzzled by；puzzled |
| B．puzzling；be puzzled over；puzzled |
| C．puzzled；be puzzled by；puzzling |
| D．puzzled；was puzzling over；puzzling |
The boss has ______ difficulty in finding a man to take the place of ____ manager.
| A．a; the | B．/; the | C．the; / | D．/; / |
— How about dinner tonight? It’s on me.
— ______.
| A．You are welcome | B．Oh, I’d like to |
| C．Well, I’m afraid so | D．That’s all right |
It rained continuously for seven days, completely _________ our holiday.
| A．ruined | B．to ruin | C．ruining | D．ruins |