You can't imagine amazing they are you see them with your eyes.
| A．what； unless | B．how； unless |
| C．how； if | D．what； if |
-- 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.
_____has your brother studied in New York? —For two years.
A. How old B. How often C. How long
Bob promises to join in the football match ______ he has to help his parents on the farm.
A. if B. as C. unless