Отметьте правильно составленное предложение: 1. my sister, who is twenty years old, is a student. my sister, which is twenty years old, is a student. 2. he worked hard this month. he has worked hard this month. 3. what a nice man! what nice man! 4. are there some chairs in the room? are there any chairs in the room? 5. they walked faster. they walked more fast.