7、她刚收到儿子的来信，大大减轻了她的忧虑。
A letter from her son, which had just been delivered to her, greatly relieved her anxiety.(注意非限定性定语从句被动语态的使用。)
8、每月一定要留出足够的钱，这样你就能买下学期的教科书了。
Be sure to set aside enough money each month so that you can buy the textbooks for the next term.(此句是祈使句，而且含有结果状语从句。)
9、尽管困难重重，我们仍决心执行我们的计划。
In spite of all the difficulties, we are determined to carry out our plan.
(两个重要的短语：in spite of 和be determined to do sth)
10、众所周知，我们的许多问题至少部分是由于没能交流思想而引起的。
It is well known that many of our problems are caused at least in part by failure to communicate.（it is well known句型的使用。）
