There is such a problem _____ we all should _____．
A．as; pay attention to it B．that; attract our attention
C．as; pay attention to D．that; attract our attention to it
How long do you believe it will be _____ Chinese people land on the moon?
A．before B．since C．when D．that
The position _____ he wants to apply is difficult to get．
A．to which B．for which C．for that D．with which
I can hardly say which dish is best –it’s simply a（n） _____ of personal taste．
A．affair B．event C．matter D．attitude
－The accident might not have happened had we been more careful．
－But we _____ at that time．
A．don’t B．didn’t C．hadn’t D．weren’t
The boss went into the house, _____ the five boys _____ in the rain．
A．left; standing B．leaving; standing
C．left; stand D．leaving; stand
