Mo Yan’s books have been sold out in many bookstores _________ his winning of the Noble Prize in Literature.
A.becauseB.since
C.asD.because of
It makes me very sad whenever I think of my grandma’s______ .
A.dyingB.diedC.deathD.dead
The little girl couldn’t be a student because of her __________.
A.illB.sick
C.illnessD.sad
__________ is really hard __ them to climb such a high mountain.
A.This; toB.It; to
C.This; forD.It; for
We must _______ to help the out of trouble.
A.try our bestB.try your best
C.tryD.trying
Must I go to a medical school and be a doctor like you ,Dad?
No,you _______ .You’re free to make your own decision .
A.can’tB.mustn’t
C.shouldn’tD.needn’t