Playing with a cell phone, he suddenly ________ the teacher staring at him.

A. knew of                       B. became aware of  

C. reflected                     D. aware for

 She seemed ________ the book before, but she said she had never.

A. to read       B. to have read C. to be reading    D. reading

 ________ on the subject for half an hour, Liu Ying suddenly stopped.

A. To be worked                  B. To work         

C. Having worked                 D. Having been worked

 She offered me practical ________ with my research, for which I would appreciate for my whole life.

A. conduct       B. certificate      C. admiration   D. assistance

 “ Look at him! He behaved ________ nothing had happened”, said Mary.

    A. as if            B. even if          C. if               D. unless

 They were singing and dancing to ________ their high spirits though it was very cold.

A. keep up       B. build up     C. bring up     D. pick up

 The weather is so ________ this year that we can hardly stand so many cold days!

A. wonderful     B. awful            C. absurd       D. accessible

 The place ________ the bridge is supposed to be built should be________the cross-river traffic is the heaviest.

A. which; where                  B. where; which

C. where; where                  D. which; which

 I have just come in to see if I can be _________ any assistance to them.

A. with          B. on           C. at           D. of

 If this computer does not give complete satisfaction, please return it to the maker stating when and where it was ________.

A. designed      B. operated     C. purchased        D. made