他们一边看着老照片，一边开玩笑并大笑。

While looking at the old photos, they ___joked and laughed together.

这是个敏感话题，所以请不要拿它开玩笑。

This is a sensitive topic, so please don't ___joke about it.

当他说他中了彩票时，我以为他在开玩笑呢！

When he said he'd won the lottery, I thought he was ___joking!