When I walked past the park,I saw some old people Chinese Taiji.( )
A.doB.didC.doingD.are doing
—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.
She is a _____ girl with two big eyes.