Period Three Grammar
基础落实
Ⅰ.用所给词的适当形式填空
1． Wood gives much smoke while ________ (burn)．
2． The letter is to be left here until ________ (call) for.
3． Do you have any difficulty ________ (express) yourself in English?
4． He spent some time ________ (squeeze) the wet coat dry.
5． Can you prevent him ________ (smoke) more?
6． When first ________ (introduce) to the market，these products enjoyed great success.
7． It shames me to say it，but I told a lie when ________ (question) at the meeting by my boss.
8． English words are easily forgotten，unless constantly ________ (repeat)．
Ⅱ.句型转换
1． He is as tall as you are if he is not taller than you.
He is as tall as you if ________ ________.
2． You may ask him questions if you have any questions to ask.
You may ask him questions ________ ________.
3． When I am in trouble，I always turn to her for help.
