They arrived at the airport of Huangquan Park______the morning of June 7th.( )
in
at
by
on
There are ________people in the square.
—Mike, it is the ________ time in ______ days that you’ve made the same mistake.—Sorry, sir. I’ll be more careful next time.
Please turn to page _________ and look at the __________picture in this unit.
Their school has more than two _____ teachers and _____ students.
China has opened its _______Antarctic research base (南极科考站) – the Taishan Station.