Who is the person_______a round face—I don’t know, either.

Who is singing in the next room –––It_______ be Lucy. She has gone to Hong Kong.

can’t trust your friend to have a relationship with another person you consider a friend, it’s a clear ______ of a problem in your friendships.”

The number of foreign students attending Chinese universities ________ rising steadily since1990

You should your teacher’s advice if you want to improve your science.—That sounds great.