21. Farmers use _____________ for fertilizing their trees. A. compost B. dung C. fertilizer D. natural dung 22. Uniforms must ____________ at school. A. be wear B. wear C. wearing D. be worn 23. Reducing means not buying products which are _________________. A. packaged B. packaging C. overpackaged D. overpackaging 24. People use first-aid _____________ ease the victim’s pain and anxiety. A. so that B. so as C. so as not to D. in order to 25. We are taking a _______________ to Ha Long Bay next weekend. A. four-day trip B. four-days trip C. four day trip D. four-day trips 26. There are ____________ daily to Ho Chi Minh City on Monday. A. fly B. flights C. flight D. flying 27. A new bridge _____________ by the end of next year. A. will be built B. be built C. is built D. builds 28. Contact an _______________ like Friends of the Earth for information. A. organ B. organition C. organizition D. organization 29. Would you mind _____________ books when you finish reading? A. return B. returning C. returned D. to return 30. Many people wear shoes and sandals made ____________ old car tires. A. of B. from C. with D. by 31. What does this sign mean? A. You must keep walking on the grass. B. You must walk on the grass. C. You can’t walk on the grass. D. You can sit on the grass. 32. Which does this notice say? A. The shop opens 7 days a week. B. We are closed at the weekend. C. We open at the weekend. D. We serve breakfast only.