3 . Two fifths of the land in that district________ covered with tress and grass.

A．are

B．were

C．is

D．be

4 . Don't b________ him if it doesn't work. It is not his fault. (根据首字母单词拼写)

6 . You had better take my advice and think carefully ________ jumping in with both feet. （用适当的词填空）

7 . The monkey was seriously injured,______(blood) heavily. (所给词的适当形式填空)

8 . My first view of the island from the air took my______(breathe) away. (所给词的适当形式填空)

9 . .Human activities contain many bad ________(behave) that affect the environment greatly. (所给词的适当形式填空）

10 . Within many theme park ________ (boundary), there are a wide variety of activities, appealing to both children and adults. （所给词的适当形式填空）