1.He gave the two workers each five dollars       start to work at once.

A. in order to              B. so that             C. so as to       D. in order that they would

2. Liu Xiang’s breaking the world record was an exciting moment,      all of us will never forget.

A. that              B. one             C. it             D. what

3. Nuclear science should be developed to      the people rather than harm them.

A. benefit           B. contribute        C. prevent         D. affect