新医院昨天正式开业。

The new hospital was ___officially opened yesterday.

皇室订婚今天早上正式宣布。

The royal engagement was announced ___officially this morning.

如果我能回到历史上的任何时间和地点，我会选择二战正式宣布结束的那一天。

If I could travel back to any place and time in history, I would choose the day when World War II was ___officially declared over.