________by keeping down costs will PowerData hold its advantage over other companies [ ]

To their great relief, the missing child returned home, ________, after an absence of two weeks. [ ]

下列各项中的加点词语全是古今异义的一项是 （ ）

The place _______ the bridge is supposed to be built should be________the cross-river traffic is the heaviest.

I don’t like ____ days because it’s toocold.