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Mr. Bob, ______ as a manager for many years, found it hard to be an ordinary clerk again.

Many children seldom communicate with adults, ________ it difficult for their parents to know what they are thinking about.

In order not to be disturbed, I spent three hours _______ in my study.

As a child, Johnson would sit on the steps alone, _______ the sun ______ down.

Sleep is important, and ______trouble having a good night’s rest can be very annoying.

______ the project in time, the staff are working at weekends.

—How do you find that Beatles’CD?
—Wonderful. It’s well worth ______.

So far nobody has claimed the money_______ in the library.

What the public is          about is whether medical workers and scientists will be able to find a cure for the new disease in a short time.

________from space, the earth, with water_____seventy percent of its percentage, looks like a “blue ball.”