Proper_____can ease people’s relationship and make their conversation more pleasant.

This is the very house （ ） my grandpa lived before his death in 1980.

（ ） relatively costly, the engine is highly efficient and needs servicing infrequently.

Mr. Green said his clients _____ our samples by the end of last month.

He studies so hard to avoid （ ） at the bottom of the class.

He learned how to use sign language to _____ with deaf customers.

Let’s read the novel together, （ ）？

You should respect others’ opinions, and at the same time you should insist on （ ） you believe is right.

I've been playing tennis with Mary. But I was _____ by her.

The committee members meet _____ every Saturday and Sunday mornings.

（ ） looked up in alarm.

_____ more time， he’ll make a first-class tennis player sooner or later.