It was after he had worked on the project for months _____ he found how to solve the problem efficiently. [ ]

When will the 2010 World Expo(世博会) come to a close —It’ll close at the end of ________.

Where is Maotai__________ —In Guizhou China.

____ you ever_____ the new Minyuan Stadium — No, I haven’t.

nable to practise their traditions,many young Romans _______ illegal behavior, such as stealing, and were usuallythe main suspects when anything went missing.