4 . In the past it was our parents and teachers that helped us in many aspects and ________ turn, we should give a helping hand to them from now on.(用适当的词填空)

5 . We are working ________ the assumption that everyone has the ability to tackle difficult problems.(用适当的词填空)

6 . 我坚信诚实的重要性，它有助于建立一个温暖、和谐的社会。
________________, which will contribute to building a warm and harmonious society.

7 . 通过这次活动，我不仅能够与他人分享好的想法，而且还学会清楚地表达自我。(not only...but also...)
Through this activity, I can ________________ clearly.