I need to call my friend David _____ coat I walked off by mistake yesterday.
| A．in whose | B．in that | C．with which | D．with her |
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 |
In some languages, 100 words make up half of all words __________ in daily conversations.
| A．using | B．to use |
| C．having used | D．used |
It was not until midnight __________ they reached the camp site.
| A．that | B．when |
| C．while | D．as |
We finished the run in less than half the time __________.
| A．allowing | B．to allow |
| C．allowed | D．allows |
Vitamin C helps our bodies make a special chemical, which __________ affects our brains, making us feel happy.
| A．in all | B．in turn |
| C．in advance | D．in short |