—Where is Xiao Wang? —I don't know.He__________ be in the library.
Sleeping pills _____ be taken sometimes for a good night’s sleep but not so often that it becomes a habit.
I have no idea about what colours look good ____my skin.
_____with care, one tin will last for six weeks.
Those who have applied for the post ____ in the office.
I hope he’ll soon ____ his disappointment and be cheerful again.