It was not until ________ couple arrived at the cinema that they found they had left ________ tickets in the office．

A．a; 不填

B．the; the

C．a; the

D．the; 不填

When ________ about his family, he is always refusing to answer．

A．asked

B．asking

C．being asked

D．mentioned

The reason ________ he can't come is ________ he has to work late．

A．because; that

B．that; that

C．why; that

D．why; because

All flights ________ because of the snowstorm, we decided to take the train．

A．were canceled

B．had been canceled

C．having canceled

D．having been canceled

We had nothing to do ________ surf on the Internet on weekends．

A．but

B．then to

C．but to

D．then

Do let your mother know all the truth, she appears ________ everything．

A．to tell

B．to be told

C．to be telling

D．to have been told

Why? I have nothing to confess ________ you want me to say?

A．What is it that

B．what it is that

C．How is it that

D．How it is that

I'm sorry to tell you that I ________ on the play ground．

A．have left your books alone

B．forgot your books behind

C．forget your books

D．left your books behind

On a ________ morning the little girl was found ________ at the corner of the street．

A．frozen, freezing

B．freezing, freezing

C．freezing, frozen

D．frozen, frozen

Though he had tried to climb to the top of the mountain several times, he didn't ________．

A．get it

B．make it

C．arrive it

D．do it