摘要： Which subject did you like best my favorate subject is math,less favorate is biology. my didn't like the science and physic We had different classes i 阅读全文

摘要： Once every three days（三天一次） Email is done online I’m mailing you a letter tomorrow Letters is sent by “postal system”(邮政系统) Mail(Letter) : is a sent l 阅读全文