首字母填空 Americans enjoy holidays and of them is camping.Each s

首字母填空 Americans enjoy holidays and of them is camping.Each summer,millions of Americans come to the countryside i cars and they f places to camp there .they like the national parks b because campers enjoy the fresh a ,the lakes and the forests in the parks.They can hike,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.