请用适当的词完成下面这篇短文，并把所缺单词填写在答题卡指定的位置上。每个空只能填写一个形式正确、意义相符的单词。

Lucy would like tell you something about this Sunday.  Some good friends going on a field trip to a big mountain. They are going to a picnic on the top of the mountain. Everyone takes some food and drink them. But two hours later, they are all and thirsty. They have to to have a rest and drink some water. Then they go on hiking. They have many problems arriving at the . Linda often goes the wrong way. Hill trips(绊倒) over a stone. Ed can't his heavy bag. Lucy hikes too slowly, they help each other. last they get to the top. They have a nice lunch and have a good time there.