1. depend后加on。此处depend为不及物动词， 应与on连用， 表示“依赖， 依靠”。

10. discuss改为discussed。非谓语动词错误。此处动词discuss与其逻辑主语subjects应为被动关系，故用discussed作定语。

Exercise 4

Life on earth depends the sun. Day after 1. _______

day we see its light and feel its warm, but we 2. _______

do not often consider about its origin. 3. _______

Yet there are many remarkable things about the 4. _______

sun. One is their distance from the earth. Even 5. _______

if it could be made, a trip to the sun would spend a long 6. _______

time even by the fastest rocket. 7. _______

The sun is a large satellite. The planet 8. _______

earth is very small in comparison. The sun make 9. _______

us to feel hot, even at a distance of 93 million miles. 10. ______

　　　 答案及解析

9. are改为is。主谓一致错误。主语time为不可数名词， 谓语应用单数形式。

8. listen前为to。have time to do sth.意为“有时间做某事”。

7. going改为go。be ready to do sth.为固定短语， 意为“准备做某事”。

6. 删去because后面的of。because后面应接一个句子； 而because of后面应接名词、 代词、 动名词。

5. informations改为information。information为不可数名词。

4. contains改为contain。主谓一致错误。主语programs为复数形式。

3. 此行无错。

2. about后加it。about是介词， 后面应接名词、 代词、 动名词作宾语。