All the information except these two pieces _____ writing the article.
| A．have been used to | B．has been used to | C．have been used for | D．has been used for |
–Do you know the man ________ visited the United States in February?
--Yes. He is Chinese Vice-President Xi Jinping. He said it was his _______ visit to the United States.
| A．who; fifth | B．that; five | C．/; five | D．which; fifth |
–Could you please tell me _______? --Yes. They are playing in the park.
| A．where are the twins | B．where the twins are |
| C．where were the twins | D．where the twins were |
---Few young people in China know about Lady Gaga, _______?
---_______, she is quite famous here in China.
| A．do they; No | B．do they; Yes | C．Don’t they; No | D．don’t they; Yes |
There goes the bell. Hurry up, _______ you’ll be late for class.
| A．and | B．or | C．so | D．but |
–Look! A man is cutting a tree on the moon.
--It ______ be true. The teacher said there is no air on the moon.
| A．can’t | B．may not | C．shouldn’t | D．mustn’t |