根据短文内容，用方框中所给单词的适当形式填空。每词限用一次。

You may think there is nothing but sand in the desert of the world, but it is not true. In the desert we can find stones. We can see hills, too. There is a little rain in the desert , but it is not enough for most plants.
The animals are. _______ to the desert people in many ways. The desert people eat the meat and drink the milk of the animals. They use their skins to makeshoes, water bags and even tents(帐篷). They use the camels(骆驼) for . _______ things.
The people of the desert have to keep . _______ from places to place. They must always look for grass or desert plants for their animals. They usually live in the tents. When there is mo more foodfor their animals, they take down their tents, put them on the camels and move to . ______place. The desert people are very .  _____ . No man in the desert would ever refuse to help the people in trouble and give them food and water.