--Does Lisa have a red schoolbag?
--No, but she has ____ orange one.

This book is bad. It is ______interesting ______exciting.
A. either…or       B. both…and     C. neither…nor

-- Could you tell me something about the boy who helped you just now?
-- Sorry, I know nothing about him. We are______.
A. friends              B. strangers       C. classmates

There are so many kinds of computers in the shop. I really don't know ______ to choose.
A. what                B. which              C. where

- Excuse me. May I use your eraser, please?
-- Sure. ______
A. Watch out!
B. Well done!
C. Go ahead.