air
- Are you going to Beijing by air?— It’s fast, but expensive. So I’m not sure. I _____ take a train.
- Air quality in our city is becoming worse and worse.—Yes. These days’ PM2.5 readings are frightening. We must do something to ______air pollution.
- Air quality in our city is becoming worse and worse. – Yes. These days’ PM2.5 readings are frightening. We must do something to _______ air pollution.