—Peter, do you know if David _________us in the fashion show this Sunday?—I’m sure if he _________his homework, he will join us.
Daniel was _______ a bad mood and didn’t talk to _______ .
I think _______ not difficult _______ English every morning.
She has written a lot of books, but_______ of them is good .
She feels unhappy, _____?
–---I wonder __________.–--Zebras.