Tom has been out of work for two years, so he has difficulty______.
--You forgot your keys when you left home in the morning.--Good heavens,___________.
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.