5. He was really hungry.　　 　, he ate up everything on the plate.

4. You came here but you didn’t see me，I was out 　　　　　　.

3. 　　　　　will China be the first to use nuclear weapons.

2. Don’t worry, work hard, you’ll succeed 　　　　.

1. When I answer the question in English，I do feel a bit nervous　　　　 　.

10. Man has already begun 　　　　(探索)the Mars, hoping to find signs of life there.

9. The Internet is a very　　　　 (方便的)way to communicate and share information with people all over the world.

8. The progress China has made in the past twenty years is very 　　　　(给人印象深刻的).

7. 　　　　　　(无轨电车) use electricity as power, which reduces pollution of the air.

6. After you buy something from a shop, you will be given a 　　　　　(收据) for your payment.