This dictionary must belong to ________.Because I saw him using it yesterday.
A .Tom’s B. Tom 
C Mary
Are you afraid of _____ alone?
A. sleep B. to sleep C. Sleeping
—Where’s Bill ?
—He ________ in the office. I saw him playing basketball on 
the playground just now.
A. can’t be B. must be C. can be
Basketball was invented by ______ Canadian doctor named James Naismith.
A. a B. an C. The
—Tom used to ______ short and fat, didn’t he ?
—Yes, he did. Now he’s tall and thin.
A. do B. like C. Be
—How do you study English so well?
—I study ________ reading English magazines.
A. at B. on C. By
