完成下列句子Many young people can use a computer ,but few of them

完成下列句子
Many young people can use a computer ,but few of them know how to look after it .Remember the following tips when you use a computer .
Keep your computer in a cool ,dry room .Too much or too little heat is bad for computers .Damp（潮湿）is also bad for them .Most computers work best at a temperature of 5-10 degrees centigrade（摄氏度）
Do not let people smoke cigarettes near your computer .Smoke of all kinds is very bad for many parts of the computer and can cause many problems .
Do not eat or drink when you are near your computer .Pieces of food or drops of water on the keyboard （键盘）can also cause many problems .
Make sure that the keyboard and the screen are the correct height for you .If they are not correct ,you will get a backache .
Make sure the screen is the correct distance from your eyes .If you wear glasses ,make sure these glasses are correct for using the computer .Some people use a different pair of glasses when they use a computer .
Keep your screen clean and do not have it too bright .A dirty screen can hurt your eyes .A very bright screen can also be bad for your eyes .If you can afford one ,buy a computer screen .It will be better for you than using the screen of a TV set .
Never use any software（软件）hat you don’t know whether they are clean or not .You must be careful because software can bring viruses（病毒）into the computer .If your computer has viruses ,it can’t work or even breaks down .
1.The best condition for computer is to be（）and （）.
2.Don’teat ,（）or（）near your computer.
3.Make sure the screen and keyboard are the correct height for you（）（）you won’t get a backache .
4.You had better use（）glasses and a clean screen（）of the screen of a TV set .
5.We can know how to （）（）our computers according to the tips above .

 cool  dry

smoke  drink
so that
correct  than
look after

再问： 4.You had better use（）glasses and a clean screen（）of the screen of a TV set .