She __________ know the answer, but I'm not sure.A. can B. may C. must
She said she would return the dictionary to me ________.
The police ____ still not sure ______ the young man killed himself or was killed.
You had better ________some food and drinks before the field trip ________.
—How many students do you think are still on the playground now? —I am afraid there are few of them, ______?
At the science museum,the students from Sunshine Middle School get to know__________.