Houses in Wuxi are now ______ expensive that ______ many people can’t afford ______ them.

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.

Do you like giraffes? –Yes, I do. I think they’re _________.

There are _________of nurses in our school but only _______of them are boys.

_________ girl in _________ red is a nurse.