填个词:After the ( ) rings ,we will have our class.

问题描述:

填个词:After the ( ) rings ,we will have our class.
用这些词中的一个,要用正确形式填!
earth
usually
bell
never
end
practice
pollution
get up
on foot
have a good time

bell(铃),铃响了过后,我们将会上课了直接填写bell不用更改成其他形式吗?