1. Now many schools in Shenzhen　　　 (交换)students for an　　 (教育的) visits to other countries. The students often have a 　　　(奖学金). They usually live with a　　 (主人)family. They　　　 (改进、提高)their 　　　(水平)of foreign language. They learn a new culture and have a lot of 　　(观光)tours. They become more　　 (自信的). They can easily keep in　　 (联系)with their new friends in the foreign countries. 　　(尽管)it is a hard job, the exchange students enjoy themselves a lot.

13. If it rains for too long time, there maybe a 　　(洪水).

Chapter 4 Educational Visits

12. The　　 (大气层) around the earth　　 (起作用)like glass.

11. The chemicals in　　 (形式)of gases cause the　　 (水平)of sea to rise.

10. The sun can give us light and 　　(热量).

9. Many of our bad habits　　 (引起、导致)pollution.　

8. If you study harder, you will have a good　　　 (结果)in the exam.

7. Plants need to　　 (吸收)water from the soil.　

6. We have no　　 (选择)but to study hard.

5. I can’t　　 (解决)the problem, can you help me?