David apologized for ______ to inform me of the change in the plan.
| A．his being not able | B．him not to be able |
| C． his not being able | D．him to he not able |
I know that our geologists think highly of his researches in the ______
| A．land | B．field | C．ground | D．Place |
The question ______ last night was of great importance.
| A．discussed | B．discussing | C．to be discussed | D．discuss |
I heard a soft _______ at the door. When I looked up, I found it was Mary.
| A．noise | B．sound | C．voice | D．cry |
Last night he left his bike outside and had it_______.
| A．stealing | B．steal | C．stolen | D．to be stolen |
To keep ______, we must do more out-of-door exercises.
| A．well | B．fine | C．fit | D．health ‘ |