若单项式-2x3yn-3是一个关于x、y 的五次单项式，则n=______．
由单项式的定义可知，3+n-3=5，解得n=5．
故答案为：5．
将所给句子中的一处错误写出并改正。
1. There are many people are playing basketball. _______________
2. Could you tell me the different between the two books? _______________
3. It was my grandpa's eighty birthday yesterday. _______________
4. Bady,it's very lazy for you to sleep late every morning. _______________
5. I wrote an 800-word's composition yesterday. _______________
6. The fish we caught is still living. _______________
7. The Great Wall is one of the most famous building all over the world. _______________
8. If Tom will study hard this term, he will catch up with his classmates. _______________
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