27. A person ____ a foreign language must be able to use the foreign language ____ all about his own.　
A. to learn, to forget
B. learning, to forget
C. to learn, forgetting 
D. learning, forgetting
28. ____ different kinds of pianos, the workers farther improved their quality.　
A. To produce
B. Being produced
C. Produced
D. Having produced
29. The students in the university are all taking courses ____  a degree.　　
A. coming to　　 B. going to　　   C. leading to　   D. turning to
30. Many things ____ impossible in the past are very common today.
A. consider　       B. considering 　      C. considered　      D. be considered
31. ____ many times, he still couldn't understand.　
A. Having been told        B. Having told 　        C. He having been told         D. Telling
32. The old sick lady entered the hospital, ____ her two sons.　
A. to support　         B. supporting 　        C. supported by　　      D. having supported
33. China is one of the largest countries in the world, ____ 9.6 million square (平方) kilometres.
A. to cover　　　     B. covered　　　     C. covers　　　     D. covering
34. "We must keep a secret of the things ____ here", the general said, ____ at the man in charge of the information office.　
A. discussed, stared seriously 　  B. being discussed, seriously staring
C. to be discussed, seriously stared 　 D. discussed, stared
35. The visiting Minister expressed his satisfaction with the talks, ____ that he had enjoyed his stay here.
A. having added　        B. to add　　　         C. adding　　　         D. added
36. "Can you read?" Mary said ____ to the notice.　
A. angrily pointing　     B. and point angrily　   C. angrily pointed 　  D. and angrily pointing
37. ____ the composition, John handed it to the teacher and went out of the room.
A. Writing　         B. Having written 　        C. Written　　　  D. Being written
38. Were you ____ when you saw that wild animal?　
A. fright　　　      B. frightening　　　   C. frightened　　　  D. frighten
39. Properly ____ with numbers, the books can be easily found.
A. marked　　　         B. mark　　　         C. to mark　　　         D. marking
40. The child sat in the dentist's chair ____.　　
A. tremble　　　         B. trembling　　　         C. trembled　　　    D. to trembled
41. At this moment the bell rang 　____ the end of class.　
A. announce　　　         B. announcing　　　         C. announced　　　         D. to announce
42. He walked down the hills, ____ softly to himself.　　
A. sing　　　         B. singing　　　         C. sung　　　         D. to sing
43. I had to shout to make myself ____ above the noise.　
A. heared　　　         B. hearing　　　         C. heard　　　         D. to hear
44. The graduating students are busy ____ material for their reports.
A. collect　　　         B. to collect　　　         C. collected　　　         D. collecting
45. The cars ____ in Beijing are as good as those ____ in Shanghai.　
A. produce, produce 　　         B. produced, produced
C. produced, producing　         D. producing, producing
46. When I came in, I saw Dr. Li ____ a patient.　
A. examine　    B. examining　　　    C. to examine　　　D. examined
47. ____ a satisfactory operation, the patient recovered from illness very quickly.　
A. Having been given        B. Having given 　        C. Giving 　　       D. Being given
48. ____ a satisfactory operation, the doctor believed the patient would recover from his illness very soon.　
A. Having been given        B. Having given 　       C. Giving 　　　   D. Being given
49. He wrote a letter to me ____ that his trip to Japan had been put off because of the bad weather.　
A. inform 　　　      B. informing 　        C. informed 　　      D. being informed
50. He reads newspapers every day to keep himself ____ about what's going on in the world.
A. inform　 　         B. informing 　        C. informed 　         D. being informed　

Keys:

1-20:  CBBBC   CDCCC   BBBBD   DABCD　　
21-40:  DBBCC   ADDCC   ACDBC  ABCAB　
41-50:  BBCDB   BABBC