Human __________ is much more complicated than that of atoms, liquids or planets.
| A．behaviour | B．conduct | C．manner | D．doing |
The engine just won’t start.Something seems________wrong with it.
| A．to go | B．to have gone |
| C．going | D．having gone |
When we saw the road________with snow，we decided to spend the holiday at home.
| A．block | B．to block |
| C．blocking | D．blocked |
They might just have a place________on the writing course—why don’t you give it a try?
| A．left | B．leave |
| C．leaving | D．to leave |
The witnesses________by the police just now gave very different descriptions of the fight.
| A．questioned | B．being questioned |
| C．to be questioned | D．having questioned |
The airport________next year will help promote tourism in this area.
| A．being completed | B．to be completed |
| C．completed | D．having been completed |