他在比赛中获得了第二名。

He won the ___second prize in the competition.

微波炉加热食物只需要几秒钟。

The microwave heats food in just a few ___seconds.

我支持小王担任学生会主席的提名。

I ___second the nomination of Xiao Wang for student council president.

我带了备用钥匙以防万一。

I brought a ___second key just in case.