Trả lời:
5, There isn't any butter in the fridge so you should go to the supermarket to buy some.
6, If I know her phone number, I'll call her.
(hoặc dùng câu second conditional cũng đc)
7, Neil Armstrong landed on a number of moon in 1969.
8, If you don't know a word meaning, try to guess that meaning.
~HỌC TỐT~
@su