8. Whenever        (回忆) the happy times in their early lives,the retired couple often tend to sing their favourite songs.

7. The serious pollution is leading to many plants and animals        (灭绝) very quickly.

6. Though having been a successful and very rich family,they are       (过着简朴的生活) .

5. By showing your fault over and over again,he is trying to        it              (使你刻骨铭心) .

4. The keepers in Taiwan said the pandas from the mainland were       (状况良好) .

3. In spite of many experiments,they        (结果白费力气) .

2. The doctors succeeded in        the drowning boy         

(使复活) .

根据中文提示用短语的适当形式填空

1. Young couples are advised to visit their parents        (时不时地) .

10. Your argument is based on a completely false        (假设) .

9. Now it is a        (强制的) rule not to smoke in public places.