you have received a letter from your english-speaking pen friend in which he/she writes thet he is very nervous preparing for school exam. write a letter giving your friends some advice how to avoid stress before exam. буду дуже вдячна ​

Dear friend,

Thanks for your last letter. I was glad to hear from you again. Sorry, I haven't written to you earlier but I was preparing for my Maths test.

In your last letter you told be about your exams. I agree that exams are a difficult period in students' life. It's rather stressful for them. I know that you're anxious about the future exams. I'd like to give you some tips. First of all, you have to study the subject hard. So, you can be sure that you'll pass the exam well. Secondly, you should sleep well and eat healthy food. Also, I'd recommend you to relax before the exam.

Well, I have to go now. My mum asked me to help her with our dinner.

Good luck with your exams.

Yours,

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1. Science is important for most people living in the modern world for a number of reasons.
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4. In some cases, such as technology of taking salt from ocean water, technology may be essential for our lives on Earth.
5. The study of the natural world may help improve life of many people all over the world.