Hello, I am a classmate of one person and I am writing this letter to you. I ask you to help my classmate, he has a serious diagnosis - lung cancer. His parents are trying to help his son, but you know, this is difficult. They work, but their income is small, to raise money for treatment, you need a lot of money that will go to doctors abroad. My classmate is an excellent, friendly and good person, and my parents are cultured and good. If you help my classmate, he will be very grateful to you. So please help him! There is no one else to help with cancer funds. Me and his parents are asking for your help! Reply to this email, we will be waiting for you! Only you can save a young man!
1)cleverer (идет сравнение между кем-то,чем-то,поэтому в конце слова будет er,будет правильно cleverer,но more clever тоже правильно,однако тут второй вариант more cleverer поэтому он не подходит
2)for (тут я так полагаю просто такое строение (рад чему-то(happy for))
3)for( till и by сразу отходят)(for потому что указано на протяжении какого периода длилось какое-то действие,а since говорит о том,когда оно началось,следовательно не подходит)
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