I usually ride _____ bike to school．But this morning，I went to school by _____ bus．（ ）
A．a； theB．the； aC．不填； aD．a； 不填
Mr.Huang was born in Nanjing，but Suqian has become his second ______.
A．familyB．houseC．villageD．hometown
—Suzy，your room is really in a mess.
—Sorry，Mum.I'll _____ right now.
A．tidy upB．put upC．look upD．stay up
The policeman told the children ______ in the river.It's too dangerous!
A．to not swimB．not to swim
C．not swimD．not swimming
—______ do you go to the school library？
—Twice a week.
A．How longB．How oftenC．How soonD．How much
Mary shut the window just now ______ she could keep the insects out.
A．so thatB．whenC．tillD．after