Let’s dress up _____ a ghost. —OK, you can dress up _____ white.[ ]

Our school is very beautiful. There are eightteachers and students in it.

Is this hotel _____ you once stayed at? [ ]

It is said the cost of medical care today is ten times as ____ as it was ten years ago.

Ten dollars is not enough to buy the bag. Could you give me ________ dollars, mum？