They soon ______ doing the same thing day after day, and finally gave up.

He has some trouble ______ his classmates, but he has no trouble ______ doing his lessons

t take me at least six hours towrite this essay—Yes, six hours ______ to writea good essay.

下列各句中，没有语病的一句是(　　)

Amy, can we give away these soft toys We ________them for many years.—Mom, but I want to keep the bear.