In my previous post I didn't include the USA when mentioning the countries they are travelling through. Shall I include it? Can you please check again?

Thank you.
1) Which countries are they travelling through? They are travelling through Ukraine, Kazakhstan, Mongolia, Russia, Alaska , Canada and the USA (I shouldn't include New York and Europe).
2) Are the following grammatical?
He hadn't read a book since he was a child.
3) It was three days since I had last met him. It was the second time she had spent her holiday with them.
4) She told me her teacher had written (her) a reprimand in her diary.
I was proud of myself when I got a good mark in my maths test.
5) It was a month since I had been attending the Spanish course/ I had been attending the Spanish course for a month

1) Which countries are they travelling through? They are travelling through Ukraine, Kazakhstan, Mongolia, Russia, Alaska , Canada and the USA (I shouldn't include New York and Europe).

Whatever you decide to include, be consistent. Name countries OR name continents OR name cities. You have named countries in your sentence, but then you write New York (city? state?) and Europe (continent). ???

2) OK

3) It was three days since I met him. It was the second time she had spent her holiday with them.

4) She told me her teacher had written a reprimand in her diary.
I was proud of myself when I got a good mark in my maths test.

5) I had been attending the Spanish class for a month. (A course is what you are studying in the class; a class is the classroom, teacher, and students with you while studying that course.)