John hadn’t been able to stop smoking suddenly;he had to control his smoking desire ________.
| A．by and by | B．sooner or later | C．little by little | D．from time to time |
When we saw the road ________ with snow，we decided to spend the holiday at home.
(2013·北京，29)
| A．block | B．to block |
| C．blocking | D．blocked |
________ the course very difficult，she decided to move to a lower level.(2013·北京，24)
| A．Find | B．Finding |
| C．To find | D．Found |
Volunteering gives you a chance ________ lives，including your own. (2013·北京，21)
| A．change | B．changing |
| C．changed | D．to change |
I got to the office earlier that day，________the 7∶30 train from Paddington.
(2013·大纲全国，25)
| A．caught | B．to have caught |
| C．to catch | D．having caught |
The witnesses ________ by the police just now gave very different descriptions of the fight. (2013·陕西，14)
| A．questioned | B．being questioned |
| C．to be questioned | D．having questioned |