How wonderful to go away for a month, _____ all worries and responsibilities!

Shanghai is the city ______ the 2010 world Expo is held. –So it is a city____ most of us want to vist this summer.

______ earth we live on is bigger than ______ moon.

What do you think is the best way_____ learning English? [ ]

My teacher is very young. He ________ medium height.