Hiện tượng bùng nổ dân số ở nước ta bắt đầu và kết thúc vào thời gian nào?

Phân biệt sự khác nhau giữa First và Firstly

Cho mình hỏi các câu này làm sao ạ?

1.I think we shouldn't buy that car.

->Let's

2.I suggest those products shouldn't be bought.

->I suggest

3.Let's take these bottles to a recycling center.

->I suggest

4.How about replacing the broken window,

->I suggest the

5.Please don't leave the light on during the night.

->I suggest that

6.Flowers won't bloom if there isn't enough water.

->Unless flowers

7.If you don't succeed you will have to try it again.

->Unless you

8.The weather was really bad, so we decided to postpone our camping.

->Since

9.Even thought he had a car, he still bought a new one.

->He had

10.The boy drove carelessly,so he caused the accident.

->Since

11. Despite not feeling well he tired to finish the word.

->Even

12.They tired hard,but they couldn't win the match.

->Despite

13.He is humorous and generous, so we all love him.

->Because of

Trình bày suy nghĩ của em về hiện tượng vứt rác bừa bãi trong trường học khoảng 10 dòng( không lấy trên mạng nha😗) cảm ơn ạ.