The ______ you study, the ______ grades you will get.

Every minute about ____ babies are born in theword, so the world’s population is increasing by _____million every year.

Mr. Crossett was made __________ hisexperiment because of his poor health and old age.

Try the new cleanerJust a few minutes every day－that’s all it takes－_________ you could have shining floors and furniture

You may arrive in Beijing early ________ you mind taking the night train.[ ]