I think AI （人工智能） in many fields will to help us solve many problems in the future．（ ）
A．used, be usedB．is used, be used
C．used, useD．is used, use
—It's really kind of you to help me with Maths，Jack.
— ______.
A．It doesn't matterB．All right
C．You're welcomeD．Never mind
—Sandy，is Mr Li in the teachers' office now？
—I am not sure.He ______ be there.
A．mustB．can'tC．mustn'tD．may
— _____ nice music lesson Mrs Wu gave us today!
—Yes.We enjoyed it very much.
A．WhatB．What aC．HowD．How a
—Is ______ here？
—Yes.We are all ready.
A．somebodyB．neitherC．everybodyD．none
Mr.Huang was born in Nanjing，but Suqian has become his second ______.
A．familyB．houseC．villageD．hometown