The World Health Organization has given some advice on________to protect us from being infected(感染)with H7N9.
| A．how |
| B．what |
| C．where |
| D．when |
How big are your____?
A．foot B．feet C．foots
Do you know the name the girl?
A. inB. on C. of
-__________snakes love music? -No，they are deaf.
A. Does B. Are C. Do
- on the desk？
-Yes, it is.
A. What's B. Where is C. Is Bill's bag
These are our books. Please look after_________.
A. their B. they C. them