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As is known to all，practice makes perfect.Good，effective writing can only be achieved through much practice.So in this unit，we intend to give you 20 topics for your writing practice. Exercise 35-1 Directions：For this part，you are allowed 30 minutes to write a composition on the titleComputers.You should base your composition on the following outline.Your composition should be about 120 words.Remember to write clearly. Computers 1)计算机在现代社会中的作用; 2)计算机在家庭中的作用; 3)你对计算机的看法。 Exercise 35-2 Directions：Write a 3-paragraph essay by using the cause-effect technique to illustrate how overpopulatlon threatens the development of society.The following outline information will be of help. Overpopulation Poses a Threat to the Development of Societies 1)scarcity of resources，including land 2)shortage of food 3)lack of health care，educational facilities and work opportunities Exercise 35-3 Directions：Write a 3-paragraph composition of no less than 120words on the titleThe Advantages and Disadvantages of Air Travel The Advantages and Disadvantages of Air Travel | 
