Ⅰ.单句语法填空
1．With our knowledge based (base) on practice，we can make great contributions to our country.
2．What's your opinion of Mr.Li's request that more time (should)_be_spent (spend) in reading English?
3．It is_recognized (recognize) that environment pollution has become one of the most serious problems that people face.
4．Having a good command of English grammar makes it easier for him to understand long sentences while reading.
