假如你是Tom,你的好朋友Mary邀请你本周和她一起去打网球.而你要为下周二的化学考试做准备,请你写

Dear Mary,
Thanks for invite me to play the tennis ball!But as you know,I am a superscien student,and I have to parper for the next week's chemistry test.So I am sorry I cannot go with you.Would you like to see the ping-pong game next week with me?
Love
Tom