Our classroom is cleaner than _______. We clean it every day.
None of them knew what had happened ______ they were told.
The man ______ on the ground was found ______, and was sent to the hospital at once.
This is ______ unusual course that is taught in ______ university, but it’s of no use to the real life.
--- Let’s go to Mr. Zhang for some advice. --- He be at home because he has gone to Shanghai for a holiday.
Don’t stay up late studying, or you will feel in class the next day.