Ⅰ.单句语法填空
1．It's high time the government took/(should)_take (take) measures to help the unemployed.
2．John was so sleepy that he could hardly keep his eyes open (open)．
3．The broadcasting station announced (announce) that a typhoon was approaching.
4．Give me a chance, and I'll give you a wonderful surprise.
5．As is well known, the brain performs a very important function, which controls the nerve system of the body.
