CONSERVATIONA. PHONETICSI. CHOOSE THE WORD WHOSE UNDERLINED PART IS PR...

30) The police are asking Mr. and Mrs. Davidson.

 ………..………

C. READING

Read the passage and choose the best answer for each blank.

Save the earth!

We are all slowly (31)….……. the earth. The seas and the rivers are (32)

……….. dirty to swim in. There is so much smoke in the air that (33)…………

unhealthy to live in many of the world’s cities. In one well-known city, for

example, poisonous gases (34)…………. cars pollute the air so much that traffic

policemen have (35)………… oxygen masks.