It was from May 1 to Oct. 31,2010__________ the World Expo 2010 Shanghai was held,__________ was a great event for the Chinese people.
—Thank you for your coffee. —But you________ it.
Lily seems to know a lot about Hong Kong, but she has never been there.
We all know the truth there are air, water and sunlight there are living things.
__ her hair getting gray, she has decided to have it dyed.
The invention of artificial hearts marked a turning point in the battle heart disease.