Father meant him ________ into business, but he chose to study medicine.

[　　]

Once ________ what to do, these computers will show great power in carrying it out.

[　　]

Revolution means ________ the productive forces.

[　　]

A rest today means ________ extra work tomorrow.

[　　]

Christic stared angrily at her boss and turned away, as though ________ out of the office.

[　　]

________ with the size of the whole earth, the highest mountain does not seem high at all.

[　　]

A. When compared

B. While comparing

C. Compare

D. Comparing

Would you read my letter and correct the mistakes, if ________ ?

[　　]

I won't go to his birthday party unless ________.

[　　]

________, we'll build another railroad in this area.

[　　]

A. If possible

B. If not

C. If it will be possible

D. If we are possible

________, he was thrown away into the river.

[　　]

A. After killed

B. After being killed

C. After killing

D. After to be killed