Exercise 9: Choose the best option to fill in the blank.

      1.   People should _______ noise.           

            A. reuse                       B. reduce                     C. recycle                    D. All are correct

      2.   _______ can be recycled.      

            A. Plastic bottles                                             B. Glasses

            C. Clothes                                                       D. A and B are correct

      3.   My older sister often _______ old envelopes to decorate her room.

            A. reuses                     B. reduces                   C. recycles                   D. All are correct

      4.   We shouldn’t use _______ to store food, let’s use bags made of natural materials. 

            A. plastic bottles         B. can                          C. paper bags              D. plastic bags

      5.   Lan always _______ books and clothes with her friends and cousins.

            A. swaps                                                         B. exchanges

            C. wraps                                                          D. A and B are correct

      6.   You should put used cans and glass bottles into _______.

            A. garden                                                        B. recycling bins

            C. organic green bins                                      D. All are correct

      7.   We should use _______ plastic boxes or bottles because they are good for health and safe for the environment.

            A. reusable                  B. refillable                 C. recyclable               D. All are correct

      8.   Soil pollution _______ many bad effects on ecosystems and human life.

            A. does                        B. causes                     C. makes                     D. All are correct

      9.   Many plants and animals die because of _______.

            A. noise pollution                                            B. environment

            C. deforestation                                              D. A and B are correct

      10. The air in this city is _______ by emissions from nearby factories.

            A. exchanged              B. reduced                  C. polluted                  D. All are correct

      11. The _______ of water pollution is the death of many types of fishes.

            A. cause                      B. effect                      C. reason                     D. solution

      12. Rising sea level can make some cities _______.

            A. pollute                    B. exchange                C. appear                     D. disappear

      13. Protecting the _______ environment is saving human life.

            A. natural                    B. polluted                  C. working                  D. All are correct