—I don’t know why Tom was absent from yesterday’s meeting.—He must have been sick, _______?
14.Teachers _____ their knowledge to their students .
13.Rainforests _____ and burned at such a speed that they will disappear from the earth in the future.
12.He got well –prepared for the job interview, for he couldn’t risk _____ the good opportunity.
11.Your sister has grown up. She is no longer ___ she was five years ago when I first saw her.
10.That year his total income, with his reward ______, _______ 1500 dollars.