一篇很短的英语完形填空 拜托~~

一篇很短的英语完形填空 拜托~~
Americans enjoy holidays and one of them is camping.Each summer, millions of Americans come to the countrysidei_____ cars andtheyf_______ places to camp there. They like the national parks b______ because campers（露营者）enjoy the fresh a_____, the lakes and the forests in the parks. They can hike(远足) , s______ and fish.They can a_______ find many animals and plants. They have a very happy life there. After that, they go b_______ to the city and start the new work again.