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If we travel a short distance, we should walk _____ taking a bus.

Then we’ll be greener people.

A.instead of               B.rather                   C.while                       

Students ought _____ the truth.

A.to tell                 B.tell                       C.telling  

—Would you like to have _____?　

—No, thank you. I’ve had enough.

A.anything more　　　 B.something more　 C.more anything　　　　　　　　　

—It smells terrible. What has happened here?

—Look, there is much waste gas _____ from the chemical factory.

A.pour                      B.pouring                C.poured         

—Have you heard from him_____ ?

— Yes, I have_____heard from him .

A. yet , already          B. already,  yet       C. yet ,just now                    

 —What did your mother say on the phone?

—She asked ________.

A. when will I come back

B. when I would come back

C. when did you come back

China has the _____ population in the world.

A.smallest                  B.most                   C.largest                       

 I couldn’t wait ________ the box as soon as I received the gift.

              A. to open                            B. for opening                    C. opening

His father has worked in this factory _____ he came here in 1980

A.since                   B.for                   C.when                  

—What has happened in your hometown?

—Great changes _____ in my hometown recently.

A.have been taken place  B.have taken place   C.have been happened