参考词汇：study hard ,relax,happy,be careful ,grades,confident,co

参考词汇：study hard ,relax,happy,be careful ,grades,confident,come true ,concentrate on...
参考词汇：study hard ,relax,happy,be careful ,grades,confident,come true ,concentrate on,
开头已给：Dear Li Lei
i am sorry to hear that you don't do well in your studies