将下列句子中的汉语部分译成英语，注意使用适当的形式。
We Chinese think that Huangyan Island must        China.(属于)
Life is much better in the city, but I still miss the lakes and hills in the countryside        .
(时常；有时)
Drinking        water every morning is good for our health.(一杯)
I don’t think it is polite to        the teacher in class.(回嘴；顶嘴)
During the Spring Festival,        are put on windows, doors, and walls as symbols of wishes for good luck and a happy new year.(剪纸)