100. The boys often c_________(cause to be mistaken)their ball with others’ balls.

99. Yangzhou Fried Rice is s_________(help to some food; help with food or drink)only at lunch and dinner.　　 .

98. It was so cold that they had to l_____ (cause to start burning )a fire to get warm.

97. The d________(描写、描述)in words of snow is very difficult.

X. 单词拼写(共5小题；每小题1分，满分5分)

　 根据首字母及汉语提示，完成下列单词的拼写，使句意明确，语言通顺。

96. We usually do some e________(实验)in physics class.