----- Nội dung ảnh -----
Do as require:

1. Destroy forest or we will save the environment. (if)
→ If we ..............................................................

2. I'll wait for you here. You get back. (until)
→ ....................................................................

3. Don’t forget to turn off the lights. You go out. (before)
→ Before .................................................................

4. I arrive at the bus stop. I will call you right after. (as soon as)
→ As soon as ..............................................................

5. My sister shops at the supermarket three times a year. (rarely)
→ My mother ...............................................................

6. I was singing a song. My mother watched T.V. (while)
→ While ..................................................................