_____ is known to everybody that the moon travels round the earth.
A．It B．As C．When D．Where
Was it during the summer vacation ______ he went to Shanghai?
A．that B．when C．where D．which
We prefer__________alone rather than__________.
A．staying; go out B．staying; going out
C．to stay; to go out D．to stay; go out
This is my dear teacher without_________help I couldn’t have passed that difficult exam.
A．who B．whom C．whose D．That
Mr. Black _______Shanghai in a few days. Do you know when the earliest plane _______ on Sunday.
A．leaves; takes off B．is leaving; takes off
C．is leaving; is taking off D．leaves; is taking off
I’ll never forget the day_________ we spent happily together
A．when B．which C．on which D．where
