Life involves making decisions and changes. Decisions and changes involve making moves, getting ___（1）___one position or spot in life to another. An effective move involves planning a route and ___（2）___ to it. Whenever you travel, you have the choice of several routes. Some routes of living are ___（3）___ and helpful. Others are negative, creating depression and despair. Knowing ___（4）___ to re-route yourself from negative outlooks, thoughts, or ideas is ___（5）___ for getting where you want to go in life. It is easy to think negatively about others or about ___（6）___. If you allow these thoughts to continue unchecked, they develop into ruts (Note: old habits) of ___（7）___. What should you do then? Well, you can say to yourself "Stop!" and refuse to ___（8）___ or believe those negative things you are saying to yourself. By refusing to let a repeating negative thought lead you to frustration, anger or depression, you avoid ___（9）___ in a rut. Instead of continuing to be worn down by a rutted track of negative and destructive thinking, you can consciously and ___（10）___ switch yourself or side-track yourself onto a path of more positive thinking.
（4）下列正确的是（ ）

A.what

B.how

C.whether

D.that