I think it's impolite _______ others waiting.( )
A.to keepB.keepingC.keep
"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
It's very kind ___________ you to lend me your reusable shopping bags.( )
A.ofB.forC.toD.with