Professor Smith, along with his assistants, ______ on the project day and night to meet the deadline.
| A．work | B．working | C．is working | D．are working |
Class regulations require ______ is the last to leave the classroom ______ off all the lights.
| A．who; should turn | B．whomever; turn |
| C．whoever; turning | D．whoever; turn |
He was not really in the mood for anything ______ it dawned on him that it had not been his fault.
| A．since | B．when | C．after | D．until |
No progress was made in the trade talk as neither side would accept the conditions of ______.
| A．others | B．the other | C．either | D．another |
_____, in some areas the electricity was cut off, ______ residents in 8 counties spend their lunar New Year’s Eve in darkness.
| A．Making matters worse, making | B．What was worse, to make |
| C．Worse still, making | D．To make matters worse, to make |