Someone called me up in the middle of the night, but they hung up _____ I could answer the phone.
| A．as |
| B．since |
| C．until |
| D．before |
I can’t stand the terrible noise ______ she is crying loudly.
| A．it | B．which | C．this | D．that |
It’s strange that she ____have failed to see her own shortcomings.
| A．would | B．should | C．could | D．might |
His teacher worried that the student spent too much time on the computer and not enough time _______.
| A．to study | B．study | C．studied | D．studying |
The teacher talked in a very low voice_____make himself________, clearly.
| A．in order to; hear | B．so as not; hear |
| C．in order not to; heard | D．so that to; heard |
________is well known that great changes have taken place in China recently.
| A．That | B．As | C．Which | D．It |