题目内容

3.After the__________of the steam engine, people' life has greatly improved.

A. find
B. invention
C. discovery
D. production

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4.He won't come. He has__________his mind.

A. taken
B. made
C. changed
D. altered

5.If you__________five to eight, you get thirteen.

A. give
B. put
C. improve
D. add

6.She studies for the best__________of the week.

A. part
B. portion
C. section
D. time

7.The task has been completed; we__________to leave tomorrow morning.

A. invent
B. try
C. intend
D. invite