Thank you for your suggestions. Normally I would include two reasons in my answers, but "crazyrobin" has pointed out that as long as you could put up one reason and fully develop it, one point is also OK, and he recommends this approach.
I will pay attention to my intonation, to pronounce the words more accurately and clearly.
In task 2, I mean through lectures, the lecturers could provide a systematic and thorough analysis of the questions.