根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Being a good student doesn’t mean you have to drop all social activities and dive in your books. It is still possible to have a healthy social life while getting good grades. __1___ Here’s how you can achieve it:
1.  Decide for yourself at the start of the term that you won’t let your schoolwork sweep you away. ___2__
2.  Write down your weekly schedule on a piece of paper. Chances are，you’ll have small gaps between classes during the week and more free time at the weekend. Make sure that every time you find yourself in one of those between-class gaps you use the time efficiently.___3__
3.  Set aside at least one large amount of time each week as free time. Keep in mind the law of diminishing returns (收益递减). Past a certain point, more hours of studying will be of little benefit. __4__ Protect both your free time and your school time carefully. If one starts to infringe (入侵)on the other, that is just the beginning of a long, slippery downhill slope.
4.  __5__ This way, you can co-ordinate(协调) your free time with theirs.
5.  Whenever possible, find social activities that take you off campus and away from your schoolwork.

A.  Balance is the key. B.  Encourage your friends to follow your similar plan. C.  It is very important to be determined about this. D.  Try not to affect other’s time and just focus on your own. E.  You are better off spending this time with friends. F.  You can spend more time on social life than on study. G.  Read a few pages of your school book or do some quick chores, for example.