8. Lucy is going back to America 　　　　　(某时) next month.

7. The wind made her hair 　　　　　(遮住) her face.

6. It is very important to save the 　　　　　　(环境) under the sea.

5. Bears never eat d　　　 　people.

4. They tried their best to stop people from p　　　 　lakes and rivers.

3. The visitors were a　　　 　at the wonderful things in the museum.

2. It’s dangerous for children to swim in this lake because it is very d　　　 　.

1. Our teacher a　　　 　us to go home early today.

10.Jim said that he would like two 　　　　(单程的) tickets.

Unit 6

9. If you know the answer, you’d better 　　　　(按) the button as quickly as possible.