根据下列句子意思及汉语提示，在下面横线上写出恰当形式的英语词组。
1. Mr. Wang is ill today, so Miss Li ________ _________ _________(代替)
2. There are two apples on the desk.
One is red and ________ _________ is green. (另一个)
3. Our city becomes __________ __________ ___________beautiful. (越来越)
4. We should ____________every exam ____________. (认真对待)
5. You can practice the piano __________ ___________ ____________.(一周两次)