Previously, a student had asked a question and I replied to it. But after me, an expert cleared her doubts and I saw many of them were wrong, maybe due to misunderstandings or typing errors. Question number 20,21 and 23 are the ones I noticed. The correct answers are written below.
The expert did nothing but put in a said 'that', which should've been told in most of the cases and didn't even change the 'if' sentenced to reported speech. They were written as they already were. To clarify, this is just for the student's benefit and wrong answers will mislead her.