__________ that he wasn't happy with the arrangements, I tried to book a different hotel.
| A．Perceiving | B．Preventing |
| C．Puzzling | D．Preserving |
______ until the lights have turned to green.
| A．Wait | B．To wait |
| C．Waiting | D．Having waited |
______ your hand over your mouth when you cough.
| A．Put | B．Putting |
| C．To put | D．To be putting |
______ left when you get to the end of the street.
| A．Keep | B．Keeping |
| C．To keep | D．Kept |
______ him enough time to get home before you telephone.
| A．Give | B．To give |
| C．Giving | D．Given |
_____ some of this juice — perhaps you will like it.
| A．Try | B．Trying |
| C．To try | D．To have tried |