_______ the age of 13, Fu Mingxia was very famous in China _______ the youngest Olympic champion.
| A．At; for | B．At; as |
| C．On; for | D．In; as |
Dropping litter ______ never allowed in our city.
| A．don’t | B．are | C．will | D．is |
It’s better ____ your voice down in public places.
| A．keeping | B．to keep | C．keeps | D．keep |
-Would you mind my opening the window?
-__________.
| A．No, not at all | B．Sorry, I’ll do it right away |
| C．Yes, please | D．I’ll be glad to |
EverydayIspendtwohours______myhomework.
| A．finishingtodo | B．finishingdoing |
| C．tofinishtodo | D．tofinishdoing |
He’s got a birthday cake____ his ____ birthday.
| A．on ，thirteen | B．for ,thirteen |
| C．on ,thirteenth | D．in ,thirteen |