There will be trees and pollution in the future.
| A．less, more | B．more, fewer | C．more, less | D．less; less |
Doctors tell people _________ their hands often and to stay home if they feel ill.
| A．to wash | B．washes |
| C．wash | D．washing |
Liu Qian has made “magic” a hot word, _________ he?
| A．doesn’t | B．didn’t |
| C．hasn’t | D．isn’t |
The world has a big headache and it _______ by money. It began in America last year.
| A．cause | B．causes | C．is caused | D．are caused |
The art club is for members only. You can’t go in _________ you are a member.
| A．unless | B．because | C．if | D．though |
— _________ yogurt do you need?
— Three cups.
| A．How long | B．How far | C．How many | D．How much |