The flu is believed ________ by viruses that like to reproduce in the cells inside the human nose and throat．

A．causing

B．being caused

C．have caused

D．to be caused

Jack ________ yet last night; otherwise he ________ me．

A．mustn't have arrived; must have phoned

B．can't have arrived; would have phoned

C．may have arrived; need have phoned

D．shouldn't have arrived; can have phoned

By the time he ________ back last night, we ________ 200 pictures from the spaceship．

A．came; had got

B．had come; got

C．was coming; got

D．would come; had got

________ that Mary was able to set up new branches elsewhere．

A．So successful her business was

B．So successful was her business

C．So her business was successful

D．So was her successful business

As we all know, it was ________ that resulted in the terrible car accident．

A．because of her carelessness

B．because she was careless

C．her being careless

D．she was so careless

Imagine life as a game ________ you are playing with five balls．You name them－work, family, health, friends and spirit．

A．where

B．that

C．as

D．which

If you go to Xi' an, you'll find the palaces more magnificent than commonly ________．

A．supposing

B．supposed

C．to suppose

D．suppose

________ Sunday, rather than ________ at home, I preferred ________．

A．It being; stay; to travel

B．Being; to stay; to travel

C．Having been; stay; travel

D．It was; to stay; travelling

The time he has devoted in the past years ________ the disabled is now considered ________ of great value．

A．to help; being

B．to helping; to be

C．to help; to be

D．helping;/

________ only 20 minutes to go before the train left, I felt uneasy in the taxi to the railway station．

A．For

B．I had

C．With

D．As