_____ a moment and I will go to your rescue. [ ]

The notice came around two in the afternoon _____ the meeting would be put off.

On his way home, he found a wallet ___ onthe ground, which he picked up and ____ in his schoolbag.

The possibility __________ pleasant smells might reduce pain has recently been suggested by new research.

选出对下面加点的字词解释有误的一项是（ ）