15. We ____________ visit our grandparents in the countryside in summer.

A. use                        B. are used                C. used to                D. are used to

16. During the last hundred years, human ____________ much damage to their environment for their own benefits.

A. did                        B. have done                C. were doing                D. would do

17. She had to take care of her baby without help from others , ____________ she?

A. didn’t                B. hadn’t                C. doesn’t                D. hasn’t

18. Her father was very worried ____________ she came home late that night.

A. so that                B. so                        C. because                D. however

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