Что где поставить?
That when where which who who who who why

I was born in the most wonderful country in Russia. I'm a patriot, that's why I love my country. For me, this is the best country, because it is in it that my parents live that gave me life, and in it I grew up. Russia is a big country with unlimited possibilities. I do not understand those who want to leave this place, as if in other countries life is much better. Our people can not win, because we are strong in spirit and never give up a comrade in trouble. Of course, in Russia, as in other countries, there are problems, but they are in all countries. Therefore, do not look for a better life abroad, because it's not for nothing that they say that it's good everywhere where we are not. There are foreigners who want to live in our country, so we should appreciate what we have. Such a beautiful and vast homeland there is no one, only the inhabitants of our country. We must cherish Russia and be proud that we were born here.

You must go to bed now. 
Ты должен лечь в кровать сейчас.

She should (may) read this book.
Ей следует прочесть эту книгу. (Она может прочесть эту книгу)

I must go home. 
Я должен идти домой.

He can (may) speak English.
Он может говорить по-английски. Если "can" то имеется в виду, что человек умеет говорить по-английски. Если "may", то он может говорить по-английски, ему разрешают это делать.

The students may use a calculator at the Maths lessons.
Студенты могут использовать калькулятор на уроке математики.

My father can drive a car.
Мой папа умеет водить автомобиль.

Jack can play the guitar very well.
Джек очень хорошо играет на гитаре.