---Can I borrow your colour pen?
---Sorry. I don't ______ one, I think he ______ one.
---Who is ______, Peter or Mike?
---Peter is, I think.
---______have the scientists been there?
---For about two years.
---“______is that boy?”
---“He's my son.”
---What's ______?
---I can't find my English book.
---Bob, it's getting cold. ______ take a jacket with you?
---All right, Daddy.
---I want some paper.Is there any in your desk?
---________.
---Why is she worried?
---She's worried _______ her test.