他正在电脑上工作。

He is ___working on the computer.

我的手机突然不工作了，现在无法打电话。

My phone suddenly stopped ___working, so I can't make calls now.

他整个周末都在努力工作，以便按时完成项目。

He spent the whole weekend ___working hard to finish the project on time.

我的手机现在可以正常使用了。

My phone is ___working properly now.

她在医院工作已经三年了。

She has been ___working at the hospital for three years.