题目内容：

语法填空

Sneezing（打喷嚏） is one way the body protects itself from 1. （sick）． Your brain2.（signal） you to sneeze． Then your eyes close and-achoo! -germs （细菌） 3.（shoot） out of your nose．

One sneeze can put as many as 40，000 droplets of saliva （唾液） and mucus （黏液） into the air． And those droplets travel up to 100 miles per hour， 4.（fast） than cars on the freeway．

Here in the US， we say "bless you" when someone sneezes． The same goes for a number of other5. （country）， including Wales and France． But 6. general it's more common 7. （connect） to health than to give blessings． In China， you say， "May you live 100 years!" In Germany， it's simply， "Health!"

8. do we wish sneezers well？ The custom may date back to 9.ancient belief． It is said that evil （邪恶的） spirits went out of our bodies during a sneeze - and that these spirits then try to get back in．

Your nose can produce up to 32 ounces of mucus every day． That's enough mucus to fill more than two soda cans．

Mucus is 10. （usual） clear． If it's green， yellow， or brown， then you might want to see a doctor．