1 . Tens of thousands of asteroids have since been discovered, with thousands more_________ each year. Asteroids are masses of rock and metal that orbit（绕轨道而行）the sun between Mars and Jupiter.

A．to be found

B．found

C．being found

D．having been found

2 . When he came to himself, he found himself ________(surround) by a group of boys. (所给词的适当形式填空）

3 . With his attention ________ (focus) on his homework, he didn’t know what was happening outside. （所给词的适当形式填空）

4 . Please take good care of yourself and keep your parents ________ (inform) of what is happening to you. （所给词的适当形式填空）

5 . Do you want to get this book ________(递送) to your house or would you prefer to come to the shop for it yourself?

6 . With the light ____________(cut) off, our room was dark.

7 . With his attention ________on the shops along the roadside, he knocked an old man down while riding to school.

A．concentrating

B．concentrated

C．to concentrate

D．being concentrated

8 . With his attention __________on the shop along the roadside, he knocked an old down while riding to school.

A．concentrating	B．concentrated
C．to concentrate	D．having concentrated

9 . We will keep you i________ as the project progresses. Please feel free to write to me if you have any suggestions on our development plan. (根据首字母填空)

10 . The Internet gives people the chance to have the information they look forward to _________（deliver）to them   quickly and cheaply. （用单词适当形式填空）