阅读下面短文，根据以下提示：1）汉语提示，2）首字母提示，3）语境提示，在每个空格内填入一个适当的英语单词，并将该词完整地写在右边相对应的横线上。所填单词要求意义准确，拼写正确。
Schools should be clean and pure spots but now something bad happens.
Everyone knows that some students ( 作弊) in examinations at 76.
school. students, we often have examinations at school, but 77.
sometimes we have too many examinations are too difficult for us. 78.
On the other hand, some of the students are l and don’t work hard at their 79.
