根据句子意思填单词。

1. We have a Chorus c_______ each year.

2. The last day of April is April the t_______.

3. —Do you have a pop c_______?

    —Sorry, I don't know.

4. September is the n_______ month of the year.

5. There is a speech c_______ between Class 4 and Class 5.

铺砌地面砖时，砂浆配合比1：2•5是体积比。