用方框里所给的单词的适当形式填空，使文章通顺、连贯、合理

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Every person needs friends. Friends are  who open their hearts to us. They always encourage us to try our  to do everything, and they even make us face challenges bravely.     in touch with our friends is important to us all. In this way, we can know how everything is going on with our friends. Friends communicate with each other in different ways. Some make phone calls to their friends    . Some send postcards to their friends when they go on holiday. Others prefer to send interesting articles and  along with their letters. Among the ways, there must be your favorite one. Anyway, let’s communicate with our friends as often as possible.