his father had come, his face lit up.
| A．Having heard | B．When he heard | C．Hearing | D．When hearing |
With trees and grass_____ about 35％ of the urban area，the city of Hefei has taken on a new look.
| A．covered | B．being covered | C．to be covered | D．covering |
Process so far has been very good．______，we are sure that the project will be completed on time．
| A．However | B．Otherwise | C．Therefore | D．Besides |
— When do we need to pay the balance?
— ____ September 30.
| A．In | B．By | C．During | D．Within |
______ and out of breath, we reached the top of the mountain and stopped _____ the beautiful scenery.
| A．Tiring, to admire | B．Being tired, admiring |
| C．Tired, to admire | D．Tired, admiring |
I greeted the teacher with “ hello”, and the teacher gave me a sweet smile ______.
| A．by turns | B．in return |
| C．in turn | D．for turn |