Look at the man standing at the school gate. Is he your math teacher Mr. Brown?
No. it ____ be him. He has gone to Chengdu on business.( )
needn't
can't
may not
mustn't
Betty ___________ hard since last term.That's why her exam results are so good!( )
A.has workedB.will work
C.workedD.was working
"A white elephant"means something that is useless,___________ it may cost a lot of money.( )
A.unlessB.untilC.sinceD.although
Sue wasn't happy because she ___________ the concert given by her favorite singer.( )
A.missesB.missedC.will missD.is missing
Johnson won't answer the phone if he ___________ the number.( )
A.knewB.doesn't know
C.will knowD.didn't know
If you want to know more about space,please ___________ the book A Brief History of Time.( )
A.look throughB.look around
C.look afterD.look down upon