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Ответ:
1) Summer is the hottest season of the year.
2) My friend knows English better than me.
3) The Volga is longer than the Thames
4) My birthday is the happiest day of the year.
5) He is the best pupil in his class.
6) My brother is good at Maths.
7) Friday is the worst day of the week. It is full of homework.
I think that roses are the most beautiful flowers.
9) Frost is worse than rain.
10) Are these words so bad?
11) Look at these books, they are more interesting.
12) My dog is better than her cat.
13) Summer days are usually wonderful.