We still lack a pair of chopsticks.

还少一双筷子。

Have you a pair of chopsticks?

你有一双筷子吗？

I split apart a pair of chopsticks.

我拆开一双筷子。

Here's a pair of chopsticks for you.

这有双筷子给你用。

With a drop of every day, once, a pair of chopsticks!

每天少用一滴水、一度电、一双一次性筷子！