great fun it is to fly in a balloon!
---Do you know __________? ---I’m not sure. Maybe he is a teacher.
It’s said ________ a little child does ________ much homework every day.
---My uncle goes to climb the Yellow Mountain every year. ---Oh, really? He ________ climbing mountains.
My sister ______ go to bed _______ my mother came back last night.
---Must I go to medical school and be doctor like you,Dad?--- No, you __________, son. You’re free to make your own decision.