It’s reported that a new planet has been discovered recently. It’s _________the earth.

A. almost three times the size of   B. three times the size than

C. three times more than         D. almost three times as larger as

 The foreigners are ______　by the _______ achievements that the Chinese have made recently in socialist construction 

A. amazing…amazing                 B. amazed…amazed 

C. amazed…amazing                  D. amazing…amazed

 The course normally attracts 20 students per year, _____ up to half will be from abroad.

A. of whom    B. in which     C. for whom   D. with whom

 We have various summer camps for your holidays. You can choose _______based on your own interests.

A. either       B. each        C. one       D. it

 ____________, he went out of the classroom.

A. Closed  the window         B. Having closed the window 

C. Closing the window            D. To close the window

 We _____ on it for several hours but we haven’t yet reached any conclusion.

A. are working        B. work 

C. have been worked   D. have been working

 The hospital we visited last month______ Beijing University.

A. attaches to   B. attached to     C. is attached to   D. was attached to

 He risked _______ so as to get the important information from the enemy.

A. arresting     B. being arrested    C. to be arrested    D. to arrest

         good , the food has been sold out.

A. Tasted     B. Having been Tasted    C. Tasting    D. To taste

 My father’s health is _____ big worry for me. There is still no sign that he has recovered from _____ operation one month ago.

A. /; the       B. a; the       C. /; an      D. a; an