他的生日是七月四日。

His birthday is on the ___fourth of July.

她将蛋糕切成四等份，拿走了其中的一份。

She cut the cake into four equal parts and took one ___fourth.

当车速达到60公里时，你应该换到四挡。

You should shift into ___fourth when the speed reaches 60 km/h.

在乐曲中，主音到下属音构成了纯四度音程。

The interval from the tonic to the subdominant is a perfect ___fourth.