For this part, you are required to write a letter. Suppose you are Wang Kai. A former classmate of yours Zhao Yong is planning to visit you during the summer vacation. Write to him according to the following outline: 1) express your welcome; 2) tell him your arrangements for his visit; 3) mention something that your former classmate should pay heed to. You should write about 100 words. Do not sign your own name at the end of the letter. Use "Zhao Yong" instead. You do not need to write the address.