根据汉语提示完成句子，每空一词。
1. 当我们发现山洞时已是半夜时分。
It was ____ ____ we found the ____.
2. 每年成千上万只蝴蝶会从各个地方来到泉边。
Every year ____ of butterflies fly to the ____ from all the places around.
3. 他看起来像是个善良又可靠的人，可实际上他只在乎钱。
He looks like a nice and ____ man, but in fact ____ he cares ____ is money.
4. 一个有决心的人总是努力去完成任务，无论它有多么困难。
A ____ man always tries to finish the job, ____ hard it may be.
5. 一旦她下定决心做某事，什么也不能改变她。
____ she has made ____ her ____ to do something, nothing can change lt.
