---What’s the low-carbon(碳) life style like?
----Save energy, produce carbon.
| A．more; more | B．less; more | C．less; less | D．more; less |
The factory ______ its waste into the river, but now it deals with the waste in a new way.
| A．used to dump | B．is used to dump |
| C．used to dumping | D．is used to dumping |
For everyone’s safety, we ___________ a1ways remember the law against driving after drinking.
| A．could | B．should | C．might | D．would |
Everyone, including her parents, _______ the Wolf Hill, and they will be back this afternoon.
| A．has gone to | B．have gone to | C．has been to | D．have been to |
Wearing white can help people _______when they feel stressed.
| A．fall down | B．calm down | C．look down | D．come down |
David didn’t give up ______ he had failed in the experiment four times．
| A．if | B．while | C．though | D．since |