When I got home, I found the door open. A．terrible thought     me—had anyone broken.
A．beat               B．knocked        C．struck         D．appeared

—What worried him so much?
—His hair’s            grey.

The book        ten units, two revisions           .

What does ‘T.G’         in ‘T.G’ Smith?

The opening policy has        many changes to china.

They didn’t know how the change had        .

—The cars give off a great deal of waste gas in the street.
—Yes, But I’m sure something will be done to       air pollution.

When they saw they were surrounded by our troops, the enemies soldiers          .

The world will be different and we will have to be more ready to_____ the changes.

Some insects ______ the color of their surroundings to protect themselves.