| 用恰当的词语填空，完成对话。每空一词。 |
| A: Hi! Linda! B: Hi! Michael! A: What bad 1_______! There is so much sand and dirt in the air. B: So it is. Have you 2_______ of the sandstorm? A: No, I haven't. What's that? B: There is lots of sand flying in the air when the wind is 3_______ strongly. So we can't see anything clearly outside. A: But what 4_______ these sandstorms? B: People do something harmful to destroy the environment, such as cutting down too many trees. A: That's too bad. I think we still need to work hard to 5_______ our environment. B: Yes, I agree with you. |