Which of the following is the greenest form of transport?

• bus

• bicycle

• motorbike

Nick is reading a novel _______ Jack is reading a cartoon.

• while

• if

• but

______ trees and burning forests destroy a lot of wildlife habitats.

• watering

• cleaning up

• cutting down

The panda’s natural ______ is the bamboo forest.

• habitat

• ecosystem

• area

What is this?

• 3Rs

• 3R

• R3s

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

• while

• when

• if

We cleaned up everything at the campsite ______ we left.

• until

• while

• before

What is that?

• plastic bags

• plastic rubbish

• plastic

hệ sinh thái

• system

• ecosystem

• extinction

san hô

• carrot

• coral

• toxic