He referred his success ________ the good teaching he had had.

[　　]

A．to　　　　B．at

C．for　　　　D．of

An average of 3000 letters a month ________ received by the newspaper's office.

[　　]

A．are　　　　　　B．is

C．has been　　　　D．have

Certainly I couldn't help being different ________ when I left the university.

[　　]

A．with　　　　B．than

C．from　　　　D．to

A bird was caught in the net and struggling ________ free.

[　　]

A．getting　　　　B．get

C．to get　　　　 D．got

I couldn't ________ when I heard the story.

[　　]

A．but laugh　　　　　　B．laughing

C．help to laugh　　　　 D．help to laughing

My sister tells us that she always ________ pity on some stray cats or dogs.

[　　]

A．takes　　　　B．makes

C．puts　　　　 D．does

She told me that she ________ by swimming and playing tennis.

[　　]

A．remained health　　　　B．kept fit

C．in good health　　　　 D．was in good health

The swimming pool is used ________ all the children ________ the neighborhood.

[　　]

A．in common with; at

B．out of the common; during

C．in common by; in

D．out of the common; of

We have been told that under no circumstances ________ the telephone in the office for personal affairs.

[　　]

A．may we use　　　　B．we could use

C．we may use　　　　D．did we use

The progress he has made in maths is much greater than ________ in English.

[　　]

A．the one　　　　B．that

C．he has　　　　 D．it