u7 e8

'When' means

• khi

• trước đó

• cho đến khi

until

• cho đến khi

• ngay khi

• trước đó

as soon as

• khi

• ngay khi

• sau đó

I was not at home _________ he came to see me yesterday.

• after

• as soon as

• when

• before

while

• trong khi

• ngoài ra

• bên cạnh đó

• khi đó

We called the forest guard unit _________ we saw the bush fire.

• as soon as

• when

• while

• before

i went straight to the gym ________ I left home.

• after

• before

• while

pollution

• rác

• sự ô nhiễm

• sự tàn phá

• chất thải

environment

• cuộc sống

• hệ sinh thái

• môi trường

bảo vệ (v)

• protect

• provide

• prevent

• prohibited