I didn’t see her in the meeting room this morning. She ______ have spoken at the meeting.
| A．mustn’t | B．shouldn’t |
| C．needn’t | D．couldn’t |
Cindy shut the door heavily and burst into tears. No one in the office knew ______she was so angry.
| A．where | B．whether | C．that | D．why |
We can never expect_______bluer sky unless we create_______less polluted world.
| A．a; a | B．a; the | C．the; a | D．the; the |
The visit _____ to Guilin is worth remembering for ever.
| A．paid | B．paying | C．to pay | D．being paid |
Some children want to challenge themselves by learning a language different from their parents speak at home.
| A．what | B．that | C．which | D．one |
______, and everything will be all right.
| A．Hold off | B．Hold on | C．Hold out | D．Hold up |