题目内容：

任务型阅读

Many kinds of birds live in the USA, but the number of them is becoming smaller every year. It is mainly because of pet cats.

Of the 90 million pet cats in this country, about two-thirds are allowed to go outside. It is said that these cats kill millions of birds each year, as well as other animals. They can also bring illness to the animals that live in people’s garden, further weakening the health of the natural populations. Allowing pet cats to go outside is not just bad for birds and wildlife, it is also bad for the cats themselves. Outdoor cats can get sick very easily. They are in danger from traffic and attacks(袭击) from other animals. In fact, outdoor cats usually don’t live past the age of five, while indoor cats often live to be 17 or older.

Keep your pet cat inside! If you raise a young cat, it’s your duty to let it play inside.

根据短文内容，完成下面表格。（每空一词）

Problems	The number of the birds is becoming 1.  .
Many pet cats are in    2. from traffic and attacks from other animals.
Reason	Pet cats are allowed to go   3.   .
What to do	People want to   4.  young cats.
They have the duties to 5.  the cats inside.