阅读短文，从短文各题所给的A、B、C、D四个选项中，选择能填入空白处的最佳选项。（每小题1. 5分，共15分）

Everyone of us1a headache. But do you know about headaches? What may cause them? And what should we do2we have a headache? When should we go to3a doctor?

A headache is not an illness, but it may show that4in your body is wrong. We may have5than one headache each month,

Usually a ever or some other6may cause headaches. You may get a headache when you work too hard. You may get a headache when you can't get cough7 . You may get a headache when you exercise on an empty（空的）8.

What should you do if you have a headache?

You should lie down and have a good9. You should get enough sleep. You shouldn't take10 exercise on an empty stomach.

If you have headaches often, you need to see a doctor.