几到英语题I visited many places including the History Museum last

几到英语题
I visited many places including the History Museum last Sat. When I ____at the hotel ,it was very late
A.got B.reached C,arrived
Must we finish giving out the posters today?
Yes,we ___.It can't be put off any longer
A.can B.may C,must
give me why you chose them
reason^