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.