他最近行为有些古怪，这让朋友们很担心。

He's been acting ___oddly lately, which worries his friends.

说来奇怪，演讲前我一点也不紧张。

___Oddly enough, I wasn't nervous at all before the speech.

奇怪的是，最便宜的选项结果却是最好的。

___Oddly enough, the cheapest option turned out to be the best.