Which of the following apps will you choose if you want to be a volunteer？（ ）
A．B．
C．D．
—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.
B．
D．
B．D．
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