题目内容：

___you go across the road,you must be careful
a.since b.after c.when d.before
They won't be back home until the work___
a.was done b.will be done c.is done d.had been done
Olive was so busy___a novel that he ___to have dinner
a.reading,forgets b.to read,forgets
c.to read,forget d.reading,forgot
They set out__for the___boy
a.searching ,losing b.searching,lost
c.to search,lost d.to search,missed
She ___the book and wanted to find the answer.
a.looked through b.looked over c.looked at
Please___before you decide___to do it.
a.think it about,what b.think it over,how
c.think it about,how d.think it of,what