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 |
He was busy writing a story, only ______ once in a while to smoke a cigarette.
| A．to stop | B．stopping | C．to have stopped | D．having stopped |
______ that she was going off to sleep, I asked if she’d like that little doll on her bed.
| A．Seeing | B．To see | C．See | D．Seen |
_________to reach them on the phone, we sent an email instead.
| A．Fail | B．Failed | C．To fail | D．Having failed |
As the light turned green, I stood for a moment, not _________, and asked myself what I was going to do.
A. moved B moving C. to move D. being moved
I’ll probably see you on Sunday； ， it will be on Monday.
| A．thus | B．then | C．after all | D．if not |