--Hello, is Mr. Smith at home?---Sorry, but he _____.
We ________ the problem for a long time, but we didn’t reach any agreement.
China sent up two manned spaceships and they were also great scientific _______ in the world.
She is one of the few girls who _____ in the kindergarten.
Every means _____ prevent the water from _____.
Not only I but also Jane and Mary ____ tired of having one examination after another.