6. Headmaster Li ___________(宣布) that there would be an English party the next day.

5. T___________ the waste things into the river is not allowed.

4. This problem is more difficult than I e___________.

3. Thomas Edison invented many things in his life. He was one of the greatest i___________.

2. My computer broke down. Could you r___________ it for me?

1. Microwave oven(微波炉) is made of m___________.