1,It's widely regarded that reading is benefitial to the youth/young people benefit from reading.
2,I'm happy you've passed the exam, you must have studied very hard.
3,Jim is kind and generous to people, but he also has his limit.
4, Some parents have their children studying all day in weekend, that's quite wrong.
5,Only John could lift that big heavy stone, he's strong enough/he has enough strength.