Since Shanghai won the right to host the World Expo, over half a million people have volunteered to ___________in all the Shanghai Expo projects .

The sunlight came in____________ the windows in the roof and lit up the whole room. 

I can’t thank you too much for your kindness because without your help I        have won the first prize in the speech contest．

Was it in 1802 when he discovered his hearing problem _____ Beethoven realized that his future ______ in composing music?

______ students up to 2, 000 , the school has built another laboratory．