_______a reply, he decided to write again.

　A. Not receiving　　B. Receiving not　　C. Not having received　　D. Having received not

The path in the park looked beautiful, _______ with_______leaves.

　　A.covered;falling   B.covered;fallen    C.covering;falling D.covering,fallen

 “Please don't forget ______ the door when you leave.”     “No, I won't forget ______ it.”

  A. to lock; to lock   B. to lock; locking         C. locking; to lock         D. locking; locking

.China is one of the largest countries in the world, _______ 9.6 million square (平方) kilometers.

　A. to cover                B. covered　         C. covers　        D. covering

 _______ how to do the homework, I went to ask my teacher for help.  

　A. Not to know　   B. Not knowing               C. Knowing not　             D. Not known

The thief drove as fast as he could to escape ________ by the police.

　A. to be caught　　     B. he caught             C. being caught 　     D. catching

I don’t allow __ in my drawing-room. I don’t allow my son __ at all.

  A. to smoke; smoking   B. smoking; to smoke

  C. to smoke; to smoke   D. smoking; smoking

________, the boy couldn't enter his house.

A. Since the key has lost             B. The key been lost    

C. Lost the key                  D. Having lost the key

The______ look on his face suggested that he had passed the exam.

　　A. exciting            B. tired          C. tiring               D. excited

The_______waiter came up to us and said,"You are welcome."

　　A.smiling      B.smiled        C.smile   D.to smile