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
