Some birds fly_______________in winter and some stay in the north.
Nobody but doctors or nurses and those ______ by Dr Hu ______ to enter the patient’s room.
--- What do you suppose ______ her look so upset? --- ______ by her boyfriend again.
What’s the matter with John? He has been sitting there for hours. — A postcard from his father_______ an attack of home-sickness in him.
The Most Beautiful Village Teacher, hosted by CCTV, honors the teachers __________valuable contributions are worthy to be respected by every Chinese.
— Pity you missed the lecture on nuclear pollution. — I____ it, but I was busy preparing for a job interview.