This morning the police ______ to the scene of the crime when it began to rain. 

By the end of last month, I _____ all the CDs of Justin Bieber.

There _______ less air pollution in the country .

 I don’t know when Kitty ___________ tomorrow, and please give this message to her when she _________________.

—Let’s go to the fashion show this afternoon, shall we? — I _________ it. It’s very interesting.