4. The teacher told us that 70 percent of the earth (cover) with water.

3. I saw him carelessly (throw) some litter on the ground. Let's pick it up.

2. As soon as you fill in the form,you (become) a new member of our club.

8. Are you clear when (meet) at the gate tomorrow?

7. Cindy often ( write) diaries in Chinese,but she doesn’t do it now because she thinks it is difficult.

6. You’d better go at once. Otherwise you (miss) the train.

5. I will not give him my report unless I (ask) to.

4. My dictionary is missing. Please find out who (take) it.

3. Everyone knows the disabled mustn't (laugh) at.