1.Do you know how scared I am?
2.Do you know how much he worried about you?
3. His monthly income is at least 8000 RMB.
4.His monthly income is not more than/ at most 5000RMB.
5.There were at least 20 persons in the classroom at that time.
6. The height is not more than 30 meters.
顺便说一句no less than和not less than的区别：
no less than不亚于,竟达……之多
1)The audience was no less than five thousand. 听众有五千人之多.
2)That hotel probably costs no less than 20 dollars a night. 那间旅馆的住宿费大约要20元一晚呢.
not less than不比……差,至少
1)I'll stay here not less than three days. 我将待在这里至少三天.
人工翻译,望采纳,谢谢.