Jack had traveled six miles across the Channel ________ his engine failed and was forced to land on the sea．

A．when

B．until

C．after

D．since

After the glass fell to the ground and broke, the boy ________ his grandmother about it．

A．didn't dare to tell

B．dare not telling

C．dare not to tell

D．not dare tell

－Darling, where ________ the key to the door?

－Oh, I ________ it here, but now it's gone．

A．did you put; have put

B．have you put; put

C．had you put; have put

D．were you putting; put

Many a quarrel ________ throughout a misunderstanding．So you should talk more with him．

A．comes about

B．comes across

C．comes out

D．comes from

It is well-known to us all that knowledge is ________ treasure, but practice is ________ key to it．

A．a; /

B．a; the

C．the; the

D．/; the

We ________ last night, but we went to the concert instead．

A．must have studied

B．might study

C．should have studied

D．would study

The average cost of a new house per square meter has ________ by 10％．

A．sent up

B．come up

C．gone up

D．brought up

I was about to go to bed ________ suddenly someone knocked at the door．

A．while

B．since

C．when

D．then

Shelly had prepared carefully for her biology examination so that she could be sure of passing it on her first ________．

A．intention

B．attempt

C．purpose

D．desire

－Waiter！how much will I pay for a night?

－Prices ________ from room to room．

A．increase

B．vary

C．range

D．divide