________ unforgettable experience it is to travel on a camel in the desert．

A．What

B．What an

C．How

D．How an

I’m going to a pop concert with Tom．He’ll ________ me at eight, so I must be ready then．

A．call for

B．call in

C．call on

D．call at

Susan decided not to work on the program at home because she didn’t want her parents to know what she ________．

A．has done

B．had done

C．was doing

D．is doing

They ________ on the program for almost one week before I joined them, and now we ________ it as no good results have come out so far．

A．had been working; are still working

B．had worked; were still working

C．have been working; have worked

D．have worked; are still working

－Are you still busy?

－Yes, I ________ my work, and it won’t take long．

A．just finish

B．am just finishing

C．have just finished

D．am just going to finish

I owe it ________ you that we succeeded in doing the experiment．

A．to

B．for

C．at

D．of

－Shall we go to the cinema this evening?

－Sorry．I can’t．I’m ________ my mom ________ at the airport at 7∶00．

A．carrying; away

B．sending; away

C．putting; off

D．seeing; off

Children are told to ________ strangers when they are out without parents．

A．watch out for

B．come up with

C．get along with

D．allow for

When Bob woke up he found himself in hospital, but he didn’t know how that ________．

A．came about

B．came out

C．came along

D．came across

I ________ Ping-pong quite well, but I haven’t had time to play since the hew year．

A．played

B．will play

C．have played

D．play