—Tom is so worried about the test that he said he was going to study all night. —Tell him he should quit ______ and get some help.
Wind power is an ancient source of energy we may return in the near future.
When changing lanes, a driver should use his turning signal to let other drivers know___.
One reason for her preference for city life is she can have easy access to places like shops and restaurants.
I can’t believe that anyone else in the school can swim as fast as you, ________?
______ for the boy to talk with his mouth full!