5 . He seems very honest on the _________ (表面) but actually he is not reliable.

6 . Some plants can float on the ___________ (表面) of water. (根据汉语提示单词拼写)

7 . ________________ is covered with water but ________________is fresh water.   
大约四分之三的地球表面被水覆盖,但只有2.53%是淡水。(分数；百分数)

8 . 她发现河面上有奇怪的东西浮着，这使她感到非常害怕。(float)

9 . 从方框中选出合适的单词,用其正确形式完成句子。选项中有一项为多余选项。

alarm   dive   scare   target   fortunate   endanger awful   behave   surface   strength   award

1. The South China tiger is classified as a critically________species.
2. _________ ,everything worked out all right in the end, despite the various challenges along the way.
3. It’s ________cold in here. Is the heater on?
4. Their friendship has continuously________ over the years.
5. The rainforest is disappearing at an________rate.
6. They plan to go________in the coming summer holiday and see the beautiful underwater world.
7. It's hard to change your________:even harder to keep it changed
8. The injured dolphin________near the island was saved by the fisherman.
9. She moved quietly to avoid________the birds away.
10. The programme is________at improving the health of teenagers.