阅读下列文章,完成相应题目。 The students at No 66 Middle School have collected empty bottles for months. In June, they are going to take them to a recycling (回收) center to sell. They will use the money to buy some books for their class reading center. Kimi has done a graph to show the number of bottles they have collected. Here it is:
In October, the students collected _____ empty bottles.
The students collected the same number of bottles in _____ and _____.
The students collected the most empty bottles in _____.
Why do the students collect empty bottles?