China is known ______the Great Wall.
| A．as | B．for | C．by | D．to |
We won’t start the meeting ________ the teacher arrives.
| A．though | B．until | C．while | D．and |
The workers are trying to ________ what’s wrong with the machine.
| A．look for | B．care for | C．find out | D．take out |
Internet is ________ used by people, especially by young people.
| A．deeply | B．widely | C．hardly | D．highly |
It’s so fine. Why not ________ outdoors?
| A．play | B．plays | C．playing | D．to play |
The plane from Beijing to Hong Kong ________ half an hour ago.
| A．put off | B．got off | C．took off | D．turned off |