----- of shoes do you wear? -----Size 7.
---Excuse me. Could you wake me up when my friend _______here?---Of course. But we still don’t know when your friend ______ here.
There are ________ teachers in our school, ________of them are women teachers.
Teenagers should learn to protect (保护) ______from all kinds of dangers.
---We have red and yellow T-shirts. Which color do you like?---I’m afraid _______. I think blue will be OK.
---What _______useful book it is!---Yeah, it tells you how to play _____ guitar.