We should ________ ‘Thank you’ when we borrow something from someone.

Do you know our town?— No, this is the first time I ________ here.

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.

Don’t eat that banana．It smells________．

When is Henry’s birthday party, Lynn? —The 18th, _____ about three o’clock in the afternoon. [ ]