4. 由于交通拥堵格林先生上班迟到了。

Mr. Green was late for work             the heavy traffic.

3. 四年前这是一个美丽的湖泊，但是现在一切都变了。

This       a beautiful lake four years ago, but now         changed.

2. 不要把污水倒进湖里。

      waste water       the lake.

1. 树对我们很重要，我们不应该砍掉它们。

Trees are important to us. We shouldn't                

(   ) 5. What a pity！ The beautiful park     It looks so dirty now.

A. went         B. goes

C. has gone    D. is going

(   ) 4. Look, there is a boy       a kite near the river.

A. flying    B. flies

C. is flying    D. fly

(   ) 3. ―Do you want to swim in this river?
―_______ The water is so dirty.

A.  Of course not.

B.   That's all right.

C.   I'd love to.

D. I'm afraid so.

(   ) 2. ―What       to your hometown in recent years? ―There are many new tall huiUlings.

A.  was happened

B.  happened

C.  have happened

D.  has happened

(   ) 1. Oh, the rice           terrible. It must he bad.

A. smells    B. hears

C. sees    D. touches

5. The girl is fashionable(时髦的)，hut she w      too much money on her clothes.