Theproblem________whenthestudentsrefusedtodotheirhomework.
I don't know how we can make ________ on the timetable for any more courses.
WeweretoldthatSuewouldbeidealforthejob,butshe________badlywhenwetalkedtoher.
Attendance at football matches have _____ since the coming of television.
In some schools children who prefer to read books rather than ________ football become social outcasts (被抛弃者 ).
It is useful to science _______ the earth as an object in space.