Ba’s class has a discussion on waste paper. His friends are learning that every day throughout the world, millions of newspapers (11)                              paper bags are away. People are collecting waste paper and (12)               it. Making paper requires a lot of trees and labor. Now if people don’t waste paper, they (13)                    save labor and money. Especially, people can save the natural resources. For every ton (14)                  recycled newsprint, ten trees can be saved. The more (15)                people save, more natural resources are preserved.

11. A. but                        B. and                              C. so                                      D. although

12. A. borrowing            B. reducing                     C. recycling                         D. planting 

13. A. would                   B. should                         C. might                                D. will

14. A. on                         B. of                                  C. from                                 D. to