(1)Dear ...,
I'm sorry to hear that you're ill,but that's quite normal and everyone maybe ill so that you needn't be worried about it too much.I'll help you with your all subjects when you are well.I think we should play sports very often from now on to stay healthy.If you have problems,please let me help you.I hope you'll be better soon.
yours,
Li Hua.
(2)Dear mummy and daddy,
How are you these days?I'm OK in school but I don't like math because it's a little difficult.However,I like my math teacher,she often helps me so I think I'll do better.I do very well in English and it's my favorite subject.I play sports for an hour every day,so don't worry about me.I hope you have a good time every day.
Love,
Yonghui
(3)Dear Tom,
I'm happy you're arriving here.Welcome to China!I'll tell you something about travelling in China.Chinese food is very delicious but you can't eat too often because it's too hot in some places.And Chinese people are very friendly ,if you have difficulties,you can ask for help.In china,I think taking a taxi is a little expensive,so it's better to take a bus when travelling in China.
Have a good trip!
Yours,
Li Hua
(4)Dear Miss Zhang,
I'm sorry to trouble you but I have some problems in learning English and I hope you can help me.First,it's very difficult for me to remember the new words.I don't know what to do.Then,I found it difficult to write English articles.Finally,it's also hard to improve my listening skills.I'm worried about my English.However,I'm lucky to be your student.I think you will help me.
Thanks.
Yours,
Li Hua