Mary isn’t my sister. _________ is my cousin.
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.
Auatar is such ____wonderful science fiction movie that I want to see it ____second time.
---_______room is small, but it’s very nice and tidy. ---Really. Let’s go and see.