Nanjing isn’t so large __________ Shanghai, however, it’s the second __________ city in East China.

—_________ I take some photos in the hall, sir?  —No, you _________.

I ________ myself more— it was a perfect day.

Cars play an important role in modern life, but they ______ also cause many problems like air pollution. 

The factory ______ its waste into the river, but now it deals with the waste in a new way.