21) ____ on a clear day, far from the city crowds, the mountains give him a sense of infinite peace.

　　A) If walking B) While walking C) Walking D) When one is walking

　　22) I understood you were third-year students ____ in English.

A) who majors B) who major is

　　C) have majored D) majoring

　　23) A cool rain was falling, ____ with snow.

　　A) mixed B) mixing C) to mix D)shavingsmixed

　　24) ____ by the police, the kidnappers had no choice but to surrender.

　　A) Surrounded B) Surrounding

　　C)shavingssurrounded D) To be surrounded

　　25)____ equal educational opportunities, American Indians in the reservations remained backward and illiterate for a long time.

　　A) Deprived off B) Depriving off

　　C) Deprived of D) Depriving of

　　26) All the exam papers ____, the teacher sent the class home.A)shavingsbeen handed in B)shavingshands in C) handing in

　　D) being handed in

　　27) ____ in 1636, Harvard is one of the most famous universities in the United States.

　　A) Founding B) It was founded C) Being founded D) Founded

　　28) There ____ no fresh drinking water and no good farm land, it was not a comfortable place in which to live.

　　A) be B) was C) were D) being

　　29) ____ in Beijing for quite a few years, Mr. Park had little difficulty understanding Chinese.

　　A)shavingslived B) Lived C) Living D) To live

　　30) Any packet ____ properly will not be accepted by the post office.

　　A) not to be wrapped B) not being wrapped

　　C) not wrapped D) notshavingsbeen wrapped

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