用适当的介词填空。

1. English is used _____ the native language in Australia.

2. We are native speakers _____ English.

3. A knife is used _____ cutting things.

4. Millions _____ people are learning to speak English in China.

5. Chinese is one _____ the official languages in the United Nations.

6. Spring comes _____ winter.

7. Today some of the mobile phones can be used to take pictures _____ a camera.

8. Thank you _____ coming to see me.

9. First we have to fill _____ a form.

10. 50% of all business deals are made _____ English.