根据短文内容，从下面方框中选择适当的词组填空，使短文内容完整正确。

preparing for,   have fun,  playing tricks on,   too much,   are strict with

Dear Jenny,
I am very sorry for not writing to you for so long. I know it is hard to believe, but I am really too busy to write.
You know, a very important exam is on its way. And I am busy    it. All the students are trying their best. And, of course, I am one of them. There is   homework and all our teachers     us. Though life seems to be tough, we can still  . April Fools’ Day really gave us a break and we had a great time   our friends.
How did you spend you April Fool’s day? Please write and tell me. I am looking forward to your letter.
Jane。