他总是喜欢吹嘘自己过去的成就。

He keeps ___bragging about his past achievements.

他在聚会上一直吹嘘自己的新车，没完没了地说了两个小时。

He wouldn't stop ___talking about his new car at the party for two hours straight.

纳粹在集中营里用毒气杀害了数百万人。

The Nazis killed millions by ___gassing them in concentration camps.

我们得先给车加满油再出发。

We should finish ___filling up the car before we leave.