24.B

25.C

26.A

27.KO BT

28.A

29.B

30.C

V:

if we plant more trees it will be fresher

If we want to reduce pollution, we shouldn't use too many cars

If we babysit we will have to ride a bicycle Every day to school

We will save money by recycling your products

If everyone throws garbage in the bin we will keep the environment clean and beautiful

If we turn off the faucet when brushing our teeth we will save water

If people travel by transport, they will reduce the harmful effects on the city

If we wake up from 6:00 we can get there before noon

xin lỗi vì còn nhiều câu chưa làm cho cậu đk tham khảo người sau nha

21. D

22. B

23. B

24, B

25. D 

26. B

27. D

28. D

29. C

30. C

IV/

31. Deforestation

32. Recycling

33. leave

34. polluted

35. recycle

36. electricity

37.  save

38. reduce

39. bin

40. Câu này mình không nghĩ ra.

V/