________ animals are in danger and there will be ________ space for them if we don’t take any actions.

–There is thick haze(雾霾)around many cities in China recently. What do you think of it ? ---I think __________ cars we drive, the less pollution the city has.

As students, we must study hard, because ___________ we study, ________ grades we’ll get.

Chemistry seems to be _____ for me of all the subjects.

– I’ve never seen someone else who draws _____ than Sally at this age. – Yes. She’s known as a talented painter in our community(社区).