I think the second sentence in find the mistake is not correct, it can be correted as follows:
2- He's known to come, if he hadn't been ill, he wouldn't have complained
. (…………………………..)
وبالنالى تكون الاجابة complain بدلا من come
أحمد عبد التواب محمد
مغاغة الثانوية بنين