6. We will begin______________________a brief discussion of the problems.
a. from b. with c. at d. on
7. Tree leaves______________________to wrap things.
a. should used b. should be used c. should been used d. should be use
8. ______________________is a wonderful natural fertilizer.
a. Compost b. Plasti c c. Envelope d. Garbage
9. Glass is broken up, melted and made into new______________________.
a. silverware b. hardware c. ironware d. glassware
10.Is the rubbish______________________every day?
a. collect b. collecting c. collected d. be collected
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