_______ Tom, we wouldn’t have been late for the last bus.

A. If we didn’t wait for           

B. If we haven’t waited for

C. we hadn’t waited for        

D. Had we not waited for

 The twin brothers stand under the tree, ______ and say nothing.

A. puzzled                   B. puzzling    

C. being puzzling            D. being puzzled

 ________ that I was puzzled.

A. So difficult a question did he ask me

B. Such difficult a question did he ask me

C. Such a difficult question he asked me

D. He asked me a so difficult question

 The factory, including its machines and buildings, ______ burnt to ashes during the fire.

A. is                        B. are         

C. was                   D. were

 – Are you cleaning my room?

– I can’t help _____. I can’t bear seeing people’s room in a mess!

A. it                        B. this        

C. anything              D. so

 He thought that painting copied by a modern artist was ______ great value and bought it ____ over a thousand dollars.

A. at; for                   B. of; for         

C. of; at                    D. for; by

 Let him who tied the bell onto the tiger take it off -- _____ started the trouble should end it.

A. whomever              B. who         

C. whoever               D. anyone

 Social networking is an important factor _______ business success.

A. devoting to               B. appealing to    

C. attaching to              D. leading to

 During the expedition in the mountains we passed through a place where in a little while we all lost out ______ of direction.

A. sense                 B. feeling         

C. idea                  D. ability

 He is free now, so he ______ go with us, but he hasn’t decided yet.

A. shall                 B. must        

C. may                   D. will