It’s the fourth time that heavy smog has hit the city this month. — It’s high time we _______ measures tofight air pollution.

I won’t have a trip to Mount Huang unless Amy ____, either.

He’ll never say a word about it ___ you have explained it to him.

You look tired. You’d better______ a good rest.

nd out of breath, we reached the top ofthe mountain and stopped _____ the beautiful scenery