我无法独自携带所有行李。

I couldn't carry all the luggage ___by ___myself.

我独自度过了夜晚。

I spent the night all ___by ___myself.

我想粉刷我的卧室，但独自做这件事很难。

I want to paint my bedroom, but it is hard for me to do this ___by ___myself.