It was said was how the Chinese first raised silk worms.
| A．that what |
| B．that which |
| C．that who |
| D．that that |
In organic farming, natural waste from animals are made use of ________ the fields.
| A．fertilizing | B．to fertilize | C．in fertilizing | D．to fertilized |
In the examination, anyone ___________ will be punished.
| A．finding cheating | B．found to cheat |
| C．found cheating | D．was found cheating |
It rained heavily in the south, _ serious flooding in several provinces.
| A．caused | B．having caused | C．causing | D．to cause |
---So you are back; are all the students present at the meeting?
---Not really, nobody but Lucy and John ___________ in the meeting room.
| A．are | B．were | C．was | D．is |
The little child usually felt frightened at night, so not until ___________.
| A．did he fall asleep his mother left the room |
| B．he fell asleep had his mother left the room |
| C．did he fall asleep did his mother leave the room |
| D．he fell asleep did his mother leave the room |