听下面一段材料,将第1至4小题的信息补充完整,每小题不超过三个单词。听材料前,你将有时间阅读各小题,每小题5秒钟;听,各小题将给出15秒钟的作答时间。本段材料读两遍。 Travel Advantages To enjoy the beauty of __1__ To breathe fresh air and __2__ Disadvantages You may be caught in the rain and may catch a __3__ while travelling. Suggestions To prepare yourself __4__ before the trip To find a companion to each other and avoid accidents.