打个电话向邀请你吃饭的朋友表示感谢，是有礼貌的。(It’s good manners to…)
___________________________________________________________

I like the colour of the cap ______ I dislike its design.　　

A. while　　 　　　　 B. if　 　　　　　　 C. despite　 　　　 D. as　　

These kinds of behaviors are _____ among young people, so we are not surprised at all .

　　A. ordinary B. common C. usual D. often

If you want to buy that pair of trousers,you will have to pay 10 dollars.

A.another

B.other

C.more

D.each

The human race is ____________ Earth’s resources.

A. running out　 B. using up　　　　 C. giving out　　　 D. using up of

An army spokesman stressed that all the soldiers had been ordered_____clear warnings before firing any shots.

A．to issue　 　　 B．being issued C．to have issued D．to be issued

____ I know where I’ll be sent is safe. I shall not worry about it.

　 A. Even though　　 B. Unless　　　　　 C. As long as　 D. While

— Excuse me, can you tell me how to get to the airport?   
— ________.
A. Certainly, you can take a No.3               B. No I don't know how
C. Yes, you could go by bus                   D. Along this road

It is thought that one billion people in the world,______is half the word’s workers, earn their living by farming.

A. if    　　　　B. that    　　　 C. which   　　　　D. what

We must keep our room clean, for dirt and disease go______, you know.

A.hand in hand　　 B.step by step　 C.from time ti time　 D.one zfter another