Birds are seldom heard __________ at night.

　 A. sing　　　 B. singing　　　 C. to sing　　　　　 D. to be singing

He is the kind of person whose desires are difficult to _______.　

　 A. be satisfied　　　　　　　　 　 B. satisfy　　

　 C. be satisfying　　　　　　　　 　 D. be satisfactory

Men need friends to share their joys and sorrows, and ______, animals also need to have friends to share with.

　 A. hopefully　　　 　 B. happily　　　 C. similarly　　　　 　　 D. likely

_______ knows the truth will tell you about it , I think .

A. Who 　 　 B. No matter who

C. Whoever 　 D. B and C

David can be really difficult _______even though he’s a nice person in general.

A. at times　　 B. in time　　　 C. at one time　　 D. at all times

Can you imagine how u　　　 it was when 7 people slept in a 3-person room?

The letter she had been looking forward to _______ her yesterday.

A. reached　　　 B. reaching　　　 C. reach　　　 D. reaches

When _____ many guests, they hurried back to school to get everything ready.

 A.invited              B. inviting              C. being invited     D. having invited

There are many things which have to _____ before we finally make up our minds.

A. be thought 　 B. be thought of　 C. think about 　 D. think of

If you live in the country or have ever visited there, ____ are that you have heard birds singing to welcome the new day.

A、situations B、facts　 C、dances D、possibilities