10. The submarine 　　　　(浸入水中) to avoid enemy ships.

9. He is studying 　　　　(土木工程) at university.

8. It is difficult to travel through the city on a 　　　　(有雾的) day.

7. A bridge is a 　　　　(建筑物) built over a river or road that allows people or vehicles to cross from one side to the other.

6. The DCIO　 　　　　(坠毁) shortly after take?off.

5. He is seriously ill. So he can’t take the　 t　　　　 examinations.

4. Water will change into ice when the temperature drops to the　 f　　 　point.

3. Burning coal has led to　 g　　　　 　warming.

2. Our school has a large hotel which a　　　 　1,000 guests.

1. R　　　 　are used to store water in case of floods or droughts.