-----Do you know _____ this teddy bear belongs to? -----Let me see. Oh, it’s _____.
---Look at these stamps. I __________ them for five years. ---Wow, they are wonderful.
--- What are you doing? ---I’m _________ the Internet.
---My dream is to be a teacher. ---Really? You must ___________ children, I think.
--- Why are you so ______, Helen? ---I thought I had lost my purse, but I didn’t. I found it in my study!
--- Does Mary work carefully? ---Yes. I think she works __________ in our class.