refuse|refused|refusing

我请他离开，但他拒绝了。

I asked him to leave but he ___refused.

他遇到了麻烦，但他拒绝了我所有的帮助提议。

He's in trouble but he's ___refused all my offers of help.

我们绝不应该拒绝帮助那些需要帮助的人。

We should never ___refuse to help those in need.

你为什么要拒绝回答我的问题？

Why are you ___refusing to answer my question?