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.

To keep_____, we should do more exercise and eat _____junk food.

This is Jim Green. You can call him ______.

.It was_________Asimov was eleven years old________ his talent for writing became obvious.

Dictionaries often explain _____ us about some special _____language.[ ]