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).