1 . ______a terrible accident, she becomes scared of driving a car.(目击)

2 . ______ (尝试) to climb the world’s second tallest mountain twice, the team finally decided to give up.

3 . When ______ different cultures, we often pay attention only to the differences without noticing many similarities.

A．being compared	B．comparing
C．Compared	D．having been compared

4 . Some farmers leave their hometown and go to work in cities, ___________(struggle) to increase their income. (所给词的适当形式填空)

5 . ______ in the queue for half an hour, the old man suddenly realized he had left the mobile phone in the car.

A．To wait

B．To be waiting

C．Having waited

D．To have waited

6 . ____ of danger in the street at night, she had to go home, with a friend ____ her.

A．Warned; accompanied	B．Having warned; accompanying
C．Warning; accompanying	D．Having been warned; accompanying

7 . In April,2009,President Hu inspected the warships in Qingdao,____ the 60th anniversary of the founding of the PLA Navy.

A．marking	B．marked
C．having marked	D．being marked

8 . 27.The question _______ at present has something important to do with our nature.

A．to be discussed	B．to be discussing
C．discussed	D．being discussed