1 . Since 18^th January, 2018, some airlines in China __________ mobile phone use on their aircrafts.

A．allow

B．allowed

C．have allowed

D．had allowed

2 . Mike hasn’t appeared for two weeks, __________ his friends are wondering what has happened to him.

A．so

B．but

C．or

D．for

3 . If Nina __________ that her husband would go to the bus stop to meet her, she wouldn’t have walked back home.

A．knows

B．knew

C．has known

D．had known

4 . —Can we play on the football field now?

—No, the grass __________.

A．will be cut

B．is being cut

C．was cut

D．has been cut

5 . Large groups that want to visit the museum have to get permission __________ they visit it.

A．unless

B．where

C．as

D．before

6 . On Sunday morning, Nancy __________ plans for the trip when her mother walked in.

A．is reviewing

B．will review

C．was reviewing

D．reviewed

7 . Moving abroad means entering a culture __________ the customs and the language are different.

A．where

B．when

C．which

D．whose

8 . Scientists are building a powerful instrument, which __________ them see deep into space.

A．has helped

B．will help

C．helped

D．would helped

9 . He will never make progress in math __________ he really wants to learn it.

A．if

B．as long as

C．unless

D．in case

10 . 选出下列句子中与其它句子不是一种类型的简单句

A．Jane loves reading.	B．He has a toothache.
C．She wants to travel abroad.	D．Lucy is a pretty American girl.