—Is this ______ model plane?—No, it isn’t ______.
Han Han is a popular writer. His new book will _________ this September.
---I’m going to take part in the piano competition next week. --- ____________
---Susan, why are you still here? They are all ready to start. ---I’m sorry, but I _________ when to start.
The black bag _________ be Anna’s. She has a blue one.
I am wondering ______________.