---The vase cost me almost 100 yuan. ---Well, it was crazy of you to spend so much money _____you could buy a much cheaper one.
There______ more than one student who_______ late this morning.
Nowadays, most people,in order to keep fit,prefer walking to driving ____necessary.
The expo will be held in Shanghai, _____a lot of advanced technology will be shown for the first time.
We ____ last night, but we went to the concert instead.
_____with this challenge, he should meet it without any hesitation.