Ⅰ.单句语法填空
1．No wonder you have got a headache.You ________(work) in front of the computer too long.
2．The conference discussed the fair ________(distribute) of income and wealth.
3．Once ________(exposure)，soil is quickly washed by the rain.
4．They decided to kick him upstairs and ________(appointment) a younger man to take his place.
5．________in this way can you make progress in English.
