10. In the future, machines ______all the work for us.
A. are doing B. will do C. were doing D. do
11. A hi-tech robot will help us children while we are away.
A. look out B. look at C. look after D. look in
12. Walking to school will help to__________ air pollution.
A. reduce B. reuse C. recycle D. refill
13. If people ______ public transport, there will be less pollution.
A. use B. will use C. can use D. used
14. If we all use _______ bags, well help the environment.
A. new B. cheap C. reusable D. reduced
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