根据所给汉语提示完成下列句子。
有时候，直到珍贵的时刻成为回忆，你才会真正认识到它的价值所在。
Sometimes, you won't know the true value of a moment _______it becomes a memory.
青少年应该敢于质疑。
Teenagers are____________ ____________ be brave enough to ask questions.
尽自己最大的努力，你迟早会取得进步。
Try your best, and you'll make progress sooner or ____________ .
据报道，武威将于20 1 4年9月举办第23届金鸡百花电影节。
It's____________ that the city of wu wei will host the 23rd Golden Rooster and Hundred Flowers Film Festival. in September, 2014.
你需要在完成作文后仔细检查，找出拼写错误。
You ______ to check carefully for__________ mistakes after writing the composition.