--- Look! It ____ be Jack on the playground.---It ____ be him. Because I saw him enter the school library just now.A. may; mustn’t B. must; can’t C. can; can’t
Don’t ______ your homework.
This is Wang Hong. ______ is a friend of ______.
— ________ is the boy?—He is about 1.80 meters tall.
—Would you like a glass of juice?—__________. It’s my favourite.
______ many vegetables is good for our health.