The possibility of replacing the desks remains ________．

A．to be considering

B．under consideration

C．considering

D．consideration

The arguments are ________ facts．

A．found on

B．basing on

C．founded on

D．laid on

We were ________ to notice the actor's beard fall off．

A．amazed

B．amused

C．ashamed

D．astonished

I ________ along the street looking for a place to park when the accident ________．

A．went; was occurring

B．went; occurred

C．was going; occurred

D．was going; had occurred

－You were out when I dropped in at your house．

－Oh, I ________ for a friend from England at the airport．

A．was waiting

B．had waited

C．am waiting

D．have waited

－What's your opinion on the matter, please?

－Oh, sorry, I ________．

A．didn't listen

B．haven't listened

C．wasn't listening

D．hadn't listened

I must apologize ________ the delay ________ replying to your letter．

A．to; in

B．for; in

C．to; of

D．to; for

Your advice ________ how to improve English is ________ to us all．

A．in, valuable

B．on, of great value

C．of, valuable

D．on, great value

Isn't it time you got down to ________ the papers?

A．mark

B．be marked

C．being marked

D．marking

－I don't suppose the police know who did it．

－Well, surprisingly they do．A man has been arrested and ________ now．

A．has been questioned

B．is being questioned

C．is questioning

D．has questioned