—Where are the Greens?
—They are in Guilin ________ vacation.
| A．in | B．at | C．of | D．on |
---The students of Class 7 are going to the seaside this weekend.
---Remember _____ them not to keep _______ alone in the sea. It’s dangerous.
| A．telling; swimming | B．telling; to swim |
| C．to tell; to swim | D．to tell; swimming |
The twin sisters have learned a lot ________ they came to China.
| A．when | B．after |
| C．since | D．as soon as |
--It ______ be the new headmaster.
-- No, it ______ be him. He went to Beijing yesterday.
| A．can; must | B．must; can’t |
| C．can; can’t | D．must; may |
— When did your uncle arrive_______ China?
— He got to Guangzhou ________ the morning of the 16th of May.
| A．at; in | B．in; in |
| C．in; on | D．in; at |
Bob never does his homework _________ Mary. He makes lots of mistakes.
| A．so careful as | B．as careful as |
| C．not as carefully as | D．as carefully as |