The school has developed an online system________ students can choose their own teachers.
A．which B．when C．that D．where
We should do what we have to do________ we can do what we want to do in the future.
A．so that B．in case C．for fear that D．now that
—Is that the small town you often refer to?
—Right, just the one________you know I used to work for years.
A．that B．which C．where D．what
Our attitude towards life is________makes the difference between our being happy or not.
A．that B．whether C．what D．which
The hotel wasn't particularly good，but I ________ in many worse hotels.
A．was staying B．stayed C．would stay D．had stayed
—I wonder why Mr Green hasn't showed up at the meeting yet.
—I'm not sure，but he________in a traffic jam driving here.
A．could be stuck B．might have been stuck
C．might be stuck D．must have been stuck
