How was your holiday —It couldn’t have been ．I just stayed in the hotel because it was raining most of the time．

The dress ____ yours.—No. It’s Lily’s.

.She carefully ______ her clothes and her hair before going into her office.

Theprofessor devoted all his life ____the treatment of AIDS．

There is a teacher’s desk ______ of the classroom. Mr. Liu is standing ______ of it.