--- My son is lost. Did you see a boy pass by here? --- I saw ______ boy hidden behind ______ tree over there. You may go and have a look.
.---You must have had a good time at the party last night, didn’t you ? ---________. Actually, it was a bit boring.
.. Shanghai is trying to control ________ number of cars on the road to ensure clean air for ________ 2010 World Expo.
.The report shows that global climate change__________the drought in Southwest of China but ______ we need to make greater efforts.
.This old computer must have been of great use to ____________ did the scientific research.
..It was _______ he said that _______ me feeling frustrated.