Choose the correct answers.                                                             

6.  If people can           wastes, they will save a lot of money.            

     A.reuse        B.reduce                            C.rebuild                           D.use

7.     new technology, we now have super smart TVs, smart phones.

     A.Because   B.Because of                     C.Thanks                           D.Thanks to

8.  Robots will do most of the housework,             we will have more time for our family.

     A. so            B.but                                 C.although                        D. if

9.  We should have recycling bins in each classroom for              things.

     A. use          B.reuse                              C.reused                            D.reusable

10.  If we plant more trees, the                  will be greener.

     A.neighbour B. soil                                C. air                                 D.neighbourhood

11. All of the machines will have a special card               .

     A.start          B.to start                           C.starting                          D.to starting

12.  If we                all the trees, there will be no more oxygen for us to breathe.

     A.cuts          B.cut off                            C.cutting                           D.cut down

13.  We should open all the windows, so we don't                        use air-conditioners.

     A.have         B.have to                           C.needn't                          D.need

14.  Plantmore trees in the schoolyard because they will provide shade and         the atmosphere fresher.

     A. do           B. make                             C. have                              D. use

15.  Our dream house will use only solar energy so that we can make the                       clean and green.

     A.nature       B.environment                  C.kitchen                          D.home

16.  Many products are now helping you              your energy bills.

     A. reduce     B.reuse                              C.recycle                           D.cut down

17.  It takes a lot of energy to keep food cool, so don't                 the fridge door open or putting hot things inside.

     A. make       B. have                              C. leave                             D. stop

18.  Future houses will have hi-tech                      rooms for all of the family members.

     A. read         B. to read                          C. reading                         D. to reading

19.  Our houses will use the sun or the wind                     electricity.

     A. to have    B. to do                             C. to make                         D. to give

20.  In the future, cars might use energy from                   .

     A. gas          B. water                            C. oil                                 D.power

21.  Our dream house will be located                    the sea.

     A. on            B. at                                  C. in                                  D.between

22.  Don't               old things because perhaps you will need them later.

     A. throw      B. throw away                   C. throwing                       D.throwing away

23.              causes many breathing problems.

     A. Fresh air  B. Fresher air                    C. Polluting air                  D.Polluted air

24.  We won't use CD players because we will have smart watches that             music.

     A. play         B. plays                             C. hear                              D. listen to

25. If you eat                                  fast food, you will be fatter easily.

     A. very         B. very much                     C. too much                      D. most

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