---What ______ the forest of Yangzhou in the last 30 years?---Yangzhou has become much greener.

—Where is Ms Li?—She          London.

___How time flies!It's already twelve o'clock.___ Oh,really? I ______ it at all.

I’m sorry, I____________ the book in my home. 

I _______ the book for two weeks. I must return it to the school library.