The place the bridge is supposed to be built should be the cross river traffic is the heaviest.
| A．which; where | B．at which; which | C．at which; where | D．which; in which |
Though we found _____difficult to avoid economic and financial crisis, we must take measures to reduce its negative impact.
| A．it | B．one | C．that | D．how |
—Does _____please you to give gifts to others?
—Sure．
| A．it | B．that | C．one | D．he |
He didn’t make ______ clear when and where the meeting would be held.
| A．this | B．that | C．it | D．these |
一When did you learn the news that Obama made a trip to Canada as President?
一 ____ was on my return．
| A．That | B．It | C．There | D．This |
--- How long will you be staying? .
--- I don’t know. .
| A．That’s OK | B．Never mind |
| C．It depends | D．It doesn’t matter |