Many kinds of birds live in the United States,but the number

Many kinds of birds live in the United States,but the number of the birds is becoming s___1____ every year.One of the leading r _____2_____ is the growing number of pet cats.By keeping your pet cats in your home,you can help give birds a better possible chance to live.
Of the 90 million pet cats in this country,about two—thirds are allowed to go o ____3____.It is said that these cats k ___4___ hundreds of millions of birds each year,as well as billions of small animals such as rabbits and f ____5____ mice.
They can also bring i ___6___ to the animals that live in people's yard,further weakening the health of the natural populations.
A ____7___ pet cats to go outside is not just bad for birds and wildlife,it's also bad for the cats themselves.Outdoor cats can get sick very easily.They are in d __8__ from traffic and attacks (攻击) from other animals.In fact,outdoor cats usually don't live p ___9___ the age of five,while indoor cats often live to be 17 or older.
Keep your pet cat inside!If you r ___10___ a young cat,it's your duty to let it play inside.
1._________ 2._________ 3._________ 4._________ 5.__________
6._________ 7._________ 8._________ 9.__________ 10.__________

1,small 2,reasons 3,outside 4,kill 5,family 6,illness 7,allowing 8,danger
9,pass 10,raise
再问： 6是什么啊
再答： 疾病