1. --- Where is Mary?
--- She ____ in the library.
A. should be B. must be
C. can be D. must have been
2. His room is dark. He must ____ to bed.
A. go B. be going
C. have gone D. have been gone
3. Will your father stay home tonight?
m not sure, He ____to work.
A. must go B. can go
C. may be gone D. may be going
4. Where is Tom?
He isnt here I think he ____ have gone home.
A. may B. must
C. might D. A or B or C