81. This gentleman is very interested in singing. He often goes to the Karaoke hall with his friends and sometimes comes home very late, _____, very early in the morning.
It is impossible for ______ little children to do ______ much work in ______ a short time.
This new-type machine____________ little room.
--You don't look so well, Mary. What's the matter with you? --Why?___________.
China has hundreds of islands, ___________ is Taiwan Island.
You must have waited here for a long time ,___________you?