4. My grandma asked me to write down all the ( relative) addresses so that she could send them the Christmas cards.

3. Walking on the moon was once an (possible) task before the 1960s. However,the dream came true later on.

2. PM2. 5   ( pollute) has become a serious problem which does harm to our health.

(B) 根据句意，写出括号内所给单词的适当形式。

1. Denmark,the kingdom of fairy tales,lies in the (north) part of Europe.

10. Daniel has lived in Shanghai (自......以来) he came to study in China.

9. Tourists,both from home and (国外) ，enjoy the beautiful view in Shangri-La.

8. It's better to give than to (收到，接到).

7. I watched them leave and then drove off in the (相反) direction.

6. It may take (数个) hours to work out the cost of the trip.

5. On November 30th,the red Porsche lost control and crashed into a tree at full (速

度) .The accident killed two men inside.