Dr. Ma used to twoor three persons in the hospital.

He___ have attended the meeting this morning. He has been staying at my home for a whole day.

You’d better exercise at least three times a week ______ you can keep fit.

Go along the street and then turn ______ left. You’ll see the hospital on ______ left.

he problem of land erosion getting moreserious, the government is searching for a way to deal withit