1,d 2,a 3,a 4,d
5,d 6,d 7,d 8,a
9,recycle 10,will not dump 11,are
12,will save 13,will have 14,were
15,would be 16,had 17,would not be
18,would grow
19,If Teachers teach environmental issues at school ,Students will be more aware of protecting the environment.
20,If Light pollution happens ,animals will change their behaviour patterns.
21,If We switch from nuclear power to renewable energy sources,The levels of radioactive polluion will decrease
22,If The water temperature increases,.Some aquatic creatures will be unable to reproduces.
23,If There didn't be so many billboards in our city,People could enjoy the view.
24,There didn't be so much light in the city at night,We could see the stars clearly.
25,If We didn't turn on the heater all the time,We would have to pay three million dong for electricity a month.
26,If The karaoke bar didn't make so much noise almost every night,The residents wouldn't complain to its owner.
27,If She didn't work in a noisy office,She wouldn't have a headache after work every day
29,The tree cannot get enough food energy to stay healthy because Leaves are damaged.
30,If I had much money now, I would buy a house in Phu Cuong