不要试图完全自己修车；那太复杂了。

Don't try to fix the car ___all ___on ___your ___own; it's too complicated.

你能自己完成作业吗？

Can you finish the homework ___on ___your ___own?

他第一次设法自己做了晚饭。

He managed to cook dinner ___on ___his ___own for the first time.