—Be quiet, Mr. Smith is coming.
—Don’t worry. It ＿＿＿ be him. Mr. Smith is much taller.
A. mustn’t B. must C. can’t
It’s not enough ____ two books in a year.
A. read B. reading C. to read
Smoking is bad for health, so the doctor advised my father _____.
A. not smoke B. not to smoke C. not smoking
______ excellent singer she is !
A. What B. What an C. How
It has been five days ______ the little girl left home.
A. since B. after C. until
The man makes a living teaching.
A. for B. with C. by