Someone called me up in the middle of the night, but he hung up ＿＿ I could answer the phone.
| A．as | B．since | C．until | D．before |
He became famous ______.
| A．in the sixties | B．in the sixty | C．in sixties | D．in sixty |
Next door to ours _____, who has just retired from work.
| A．where lives an old man | B．where does an old man live |
| C．lives an old man | D．does an old man live |
So _____ that modern industry cannot develop without it.
| A．electricity is important | B．important is electricity |
| C．electricity important is | D．important electricity is |
Scarcely _____ raining _____ the PLA fighters started on their way again.
| A．it had stopped...before | B．it had stopped...then |
| C．had it stopped...than | D．had it stopped...when |
Never _____ forget the days when _____ together with you.
| A．shall I...I lived | B．shall I...did I live | C．I shall...I lived | D．I shall...did I live |