--- ________ of them knows the answer. What can we do now?  --- Let’s ask a third boy for help.

 -------How many students are there in the classroom? ------- ________ .They are all on the playground.

—Will you take the blue shirt or the yellow one?—     is the right size for me, I’m afraid.

We've got two TV sets, but we still can't watch anything because ______ works properly.   

I don’t believe_____: he said he had finished his homework by himself.