Ⅰ.单句语法填空
1．When Jane opened the door, she found surprisingly her twoyearold son ________ (dress) up as policemen and enjoying himself.
2．________ (base) on the careful plan and preparation, his experiment was a complete success.
3．________ a consequence of being late for the conference，the secretary was dismissed from the company.
4．Learning to play basketball calls for perseverance, strength, time and skill. ________ short, it's not a simple thing.
5．To her delight, her parents have approved ________ her going abroad for further study.
