根据句意及汉语提示，写出各单词的正确形式，每空一词。
China will celebrate the seventieth anniversary（周年） of the ___________(胜利) of the Great Patriotic War（反法西斯战争）this year.
The boy often helps his mother to ___________ （分开） the good apples from the bad ones.
The doctor advised me to get up and sleep at a ____________ (固定的) time， but I found it very hard.
He kept remembering English words every day though he was in his _________ (四十).
The heavy smog makes it more difficult for us to see traffic signs _________(清楚地).