根据句意，用括号内所给单词的适当形式填空。
With the ___ (develop) of modern medicine, most eye problems can be treated and cured .
They want to borrow my car, for ________ (they) won’t start.
All the players did their best to finish the training ________ (success).
My friend Kate went to live abroad in her ___________(twenty).
We all know ______________ (pollute) water does harm to our health.