---Is John coming by train?    ---He should, but he ________ not. He likes driving his car.

The lady in the sitting room           be over sixty. She looks so young.

He ________be at home because the light in his room is on.

----Will Barbara come to our party? ----I am not sure, because he ____ go to the concert with his friend.

The weather in Inner Mongolia is always dry, but sometimes it _____ rain heavily.