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She had an unpleasant experience ................. she was in Thai Lan.

• when

• or

• by

• but

I lock my bicycle ____ going to class.

• before

• while

• because

• who

I bring my own lunch ____ the food in the canteen is terrible.

• unless

• while

• since

• whom

The ghost floated up the stairs  __________ the next morning.

• while
• since
• until

absorb

• hấp thụ

• nhả ra

• thu hút

• duy trì

khí CO2

• carbon

• carbon footprint

• carbon dioxide

• carbonic

môi trường (adj)

• environment

• environmental

• environmentally

• environmentalist

habitat

• môi trường sống

• hệ sinh thái

• loài

• tuyệt chủng

hệ sinh thái

• habit

• habitat

• ecosystem

• greenhouse

than đá

• soil

• oil

• stone

• coal