题目内容：

    According to the Center for Disease Control and Prevention (CDC) (疾病控制预防中心), if you don't often wash your hands, you can pick up viruses from many places and make yourself ill. You're at risk every time you touch your eyes, nose or mouth. Actually, one of the most common ways people catch colds is by rubbing (揉擦) their noses or their eyes when there are cold viruses on their hands. If you don't often wash your hands, especially when you're sick, you may spread the viruses directly to others. You should wash your hands in the following situations:

●    After using the bathroom.

●    After blowing your nose or coughing.

●    Before eating, serving or preparing food.

●    After touching pets or other animals.

●    After visiting anyone who is sick.

●    When your hands are dirty.

There's a right way to wash your hands. Follow these simple steps to keep your hands clean.

●    Use warm water (not cold or hot).

●    Wash for 15 seconds.

●    Rinse (冲洗) well under warm running water and dry them with a clean towel (毛巾).

1.The way to protect against the spread of illness is to __________.

2.Using running water which is __________ is the correct way to wash our hands.

3.We must wash our hands after we use the __________.

4.It is also necessary to wash hands before we have __________.

5.According to the passage, the time needed to wash hands is __________ seconds.