— Look at the boy playing basketball on the ground. Is it George?— It ________ be him. He told me he would play basketball after class, but he’s not sure.

—You must have met him the other day.　　—Oh, no, I ________.

I ________ use a clock to wake me up because at six o’clock each morning the train comes by my house.

— Must we finish all the exercises today? — No, you ________.You can finish them within two days.

—Mother, I climbed up to that tall tree and picked this big apple.  —Jesus! You______ down and hurt yourself.