–You can’t imagine _______ great fun chatting online is.– Really? But it may cause you a lot of trouble.
-Are you going to the cinema_______ underground? -No. I am going there_______ a bus.
If __________ bicycle is broken, _________ can use __________.
-There_______ a show next weekend. Would you like to watch it? -Of course, I'd love to.
We are happy_______ you to the party for our friends from Beijing.
After reading for an hour, you'd better_______ the green trees for a minute or two.