The police refused to _____ the clues they were working on.

A. exhibit          B. disclose               C. expose       D. discern

I can’t say which wine is best, it’s a(n)___ of personal taste.

A.thing         B. event             C.affair     D. matter

－Did you remember to return the book to our English teacher?

－Yes. I gave it to him ________ I saw him.

A. once           B. while              C. if              D. the moment

We were just ________ calling you up ________ you came in.

A. about; when                             B. on the point of; while

C. on the point of; when                   D. on the point of; as

Only when the government increases affordable homes for low-income groups______.

A．the imbalance of demand and supply can be removed

B．can be removed the imbalance of demand and supply

C．can be the imbalance of demand and supply removed

D．can the imbalance of demand and supply be removed

Only when the villagers were faced with water shortage___ ____ how serious the problem of water pollution was．

A．did they realize                B．will they realize 

C．they did realize                D．were they realized

If a studem can make what has been learned whether in class of from social practice      ,he will make steady progress.

    A he    B him    C himself     D his

She asked the doctor to speak to her parents on her___.

A. aspect         B. behalf       C. appearance         D. background

Urban congestion would be greatly relieved if only the ______ charged on public transport were more reasonable.

A) prices             B) tickets          C) fees              D) fares

The flood has caused ______to this village.

A. many damages     B. much damages    C. much damage      D. few damages