They are broadening the bridge to _______ the flow of traffic.（ ）

A. put off　　 B. speed up　　 C. turn on　　 D. work out

Exercise One should be done in class as an example, while the rest _____ as homework.

A. is to be finished B. are to finish C. are to be finished　 D. is to finish

------How beautiful the small town is!
   ----- It is just the place _______ I was born twenty years ago.
  A．that B．which C．where D．what

We were about to climb up to the top of the mountain ________ it began to rain heavily.

A. as　　　　　　 B. while　　　　 C. when　　　　　 D. since

____, athletes from all over the world compete the Olympic Games____the honor of winning.

A. Every fourth year, in; for　　　 B. Every four year, in; for　

　 C. Every fourth years, against; in　 D. Every four years, for; for

I didn’t manage to do it_________ you had explained how.
A. unless                       B. until?
C. when                        D. since

Leaving behind family members, these farmers are strangers to the cities ______ they work.

　 A. in that　　 　 B. at which　　 C. where　　 D. which

I hope you will find this valley a beautiful place　　 you may spend your weekend．

　 A．that　　　　 B．w hich　　　 C．when　　　　 D．where

After we walked ______ the forest, and ______ a river, we arrived at that small village.

　 A. across; across 　 B. through; across

　 C. across; through 　 D. through; through

.To save class time , our teacher _______________________ （让学生做一半的练习 )in class and complete the other half for work.(have)