The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.
When you retell the story, don't any important details.
World Expo is regarded as the Olympic Games of the economy, science and technology, expert said.
---- Mary, you water the plants in the garden and I will cook the dinner. ----_____
_____ private cars are bringing us convenience, they may also cause more traffic accidents and pollution.
_____ all over the hills and around the lake are wild flowers of different colors.