Ⅰ.单句语法填空
1．He began to take political science ______(serious) only when he left school.
【答案】 seriously
2．They built a wall to avoid soil ______(wash) away.
【答案】 being washed
3．I would appreciate ______ if you could reply to me as soon as possible.
【答案】 it
4．—Did Jack admit ______ (take) some books without telling anybody?
—Yes，he did.He said he took three books.
【答案】 having taken
5．—You know，Tom is a little slow ______ speaking，so...
