-When did the Great Wall __________?-In the Qin Dynasty.
---“The last one ____ will pay for the meal.” ---“Agreed!”
____ that we all went out, lying in the sun.
She __________ have left school, for her bike is still here.
News came from the office __________ Wang Lin had been admitted to Beijing University.
Among all the birthday gifts ______ a DIY card, which I like best.