I thought ____ no use talking with him. _____ was a waste of time.
| A．there; There | B．it; It | C．there; It | D．it; There |
The new discovery is of ________.
| A．great significance | B．very significance |
| C．great significant | D．very importance |
Once _____ , the machine will keep running.
| A．start | B．started | C．to start | D．starting |
____ in thought, he almost ran into the car in front him.
| A．Losing | B．Having lost | C．Lost | D．To lose |
— Good morning, can I help you?
— I’d like to have this watch _______.
| A．fixed | B．to be fixed | C．to fix | D．fixing |
Look at the trouble we’re in. If only we _____ our teacher’s advice.
A. had taken B would have taken C. took D. have taken