----May I borrow your pen, Mike ? ----Yes, of course. Here are some and you can take ______ of them. 

I went to the Window of the World in Shenzhen. It’s ____ great ______to see a lot of beautiful views in one day.

— Have you ________ watched the dolphin show in the Ocean Park in Hong Kong?—Not _________.

There is a big cake. _______ share it.

--- Have you _________ chatted with your friends on the Internet?--- No, ________.