根据汉语意思，完成下列句子：
我想要知道中国文化和西方文化的不同之处。
I want to know some ___________ between Chinese cultures and ________ cultures.
在许多国家玫瑰被当作是爱的象征。
Roses are ___________ as a ___________ of love in many countries.
他们已经成功完成了那个艰苦的工作。
They have ____________ in __________ the hard work.
他已坚持写小说几年了。
He’s ________  to _________ novels for a few years.
老师对我们所做的事很满意。
Teacher is __________ _________ what we did.