You will know more about foreign customs as well as foreign habits and your horizon will be broadened, if you often communicate with foreigners.

You will know more about foreign customs and habits, and you can broaden your horizon as well, if you often\frequently

communicate with foreigners.

和同学们一起去旅游是个交朋友的好机会。

Traveling with classmates provides a good opportunity to make friends.

有的父母根本不知道如何教育孩子，不是合格的老师。

Some parents are not qualified teachers, for they do not know how to educate their children at all.

每天都有很多车在小区周围的道路上行驶，对行人的安全造成巨大的威胁。

There are many cars running on the streets around the community every day, which poses a gigantic threat to the safety of the

people walking around/passers-by.

大公司里面的能人很多，可以教我们学习科学技术知识，促进自己的成长，有利于自己的事业的发展。

There are many capable brains in big companies who could teach us a lot of science and technology and promote our personal growth, which is beneficial to our career development.