My friend, who ________ on the International Olympic Committee all his life, is retiring next month．

A．served

B．is serving

C．had served

D．has served

Only then ________ how much damage had been caused．

A．she realized

B．she had realized

C．had she realized

D．did she realize

I ________in London for many years, but I’ve never regretted my final decision to move back to China．

A．lived

B．was living

C．have lived

D．had lived

What we used to think ________ impossible now does seem possible．

A．is

B．was

C．has been

D．will be

－Where did you put the car keys?

－Oh, I ________ I put them on the chair because the phone rang as I ________ in．

A．remembered; come

B．remembered; was coming

C．remember; come

D．remember; was coming

The coffee is wonderful．It doesn’t taste like anything I ________ before．

A．was having

B．have

C．have ever had

D．had ever had

I can’t see any coffee in this cupboard．________?

A．Has it all been finished

B．Was it all finished

C．Has it all finished

D．Did it all finish

While watching television, ________．

A．the doorbell rang

B．the doorbell rings

C．we heard the doorbell ring

D．we heard the doorbell rings

When the old man ________ to walk back to his house, the sun ________ itself behind the mountain．

A．started; had already hidden

B．had started; had already hidden

C．had started; was hiding

D．was starting; hid

We like Jack because he is a man ________ everybody thinks is pleasant to ________．

A．who; talk

B．whom; get on with

C．who; get on with

D．whom; talk with