( )5.Welcome to our school.Let me___you____each other.A.to introduce;to B.introduce;to C.ask;to D.get;to
( )6.He went back____that the door was closed.A.making sure B.to make sure of C.to make sure about D.to make sure
( )7.She thanked me and____the gift.A.accept B.accepted C.receiving D.received
( )8.I received my friend's letter last week,but I didn't____immediately.A.agree B.answer to C.reply D.reply to