1. reduce: giảm, hạn chế = To make something less or smaller in size, quantity, price, etc.

2. reuse: tái sử dụng = The act of using something again

3. recycle: tái chế = To treat things that have already been used so that they can be used again

4. survey: khảo sát = An investigation of the opinion, behavior, etc. of a particular group of people, which is usually done by asking them questions

5. wrap: gói = To cover something completely in paper or other material, for example when you are giving it asapresent

6. classmate: bạn cùng lớp = A person who is or was in the same class as you at school or college