Did you catch the first bus to school this morning?
No I didn't. It had started moving ______ I could get on it.( )
after
since
before
as soon as
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.