The gladdest moment in human life is a departure into unknown lands. For students, the most 1_______ time for them is summer vacation, while summer is very likely the most crowded 2_______ season. If you are making a travel 3________ for mountain resort, you may need to prepare a pair of 4_______ boots and a light back pack to make you free and agile when climbing the mountains. You may have a chance to 5_______ of some adventures such as rock climbing and rappelling. If you want to save time as well as money, you’d better book a 6________ tour with a local travel agency for you and your friends.