Chinese President Xi Jinping made a speech at the 4th Nuclear Security Summit ______ March， 2016.

Peter Parker participated in a science exhibition, ______ he was accidentally bitten by a spider ______ was exposed to radiation (辐射) .

下列各句加点词古今相同的一项是

You can go out, _________you promise to be back before 11 o’clock

I just wonder that makes you so excited