ering his health, I advise him to ______ an hour or two each day to work out.

Our physics teacher and English teacher always give their lessons in a lively and clear way, ______ greatly benefits us students.

He looked as though he _________ a ghost（鬼）

Is Millie at school today — No. She’s at home________ her illness.

This kind of music,first_________in the 1700’s,has become very popular