― Why ______ you stay in the countryside,where it is not convenient to go shopping―But I’ve found it rather valuable for myhealth.

Hurry up! The bus is coming.– Wait a minute. Don’t cross the street ____ the traffic lights are green.

Many Chinese universities provide scholarships forstudents _______ financial aid.

Lily doesn’t know ________ she and her friends can do to help the little boy ________ parents have left their hometown for making money.

Sir, you ________ take this seat. It’s just for the old.