—Can you describe ___ it happened?
—Yes, I was riding on my bike ___ a car knocked me down from behind．
| A．when; as | B．how; as | C．how; when | D．how; while |
The ____ bell has been repaired by an _____ engineer.
| A．electrical; electric | B．electrical; electrical |
| C．electric; electrical | D．electronic; electric |
Who do you _____ the newspaper send to cover the bank robbery?
| A．know | B．suppose | C．think | D．suggest |
It took the police a long time to find some evidence. The new evidence led to ____________.
| A．the robber having caught | B．catch the robber |
| C．the robber being caught | D．the robber to be caught |
It is considered to be almost a crime to ______ children to violence on TV.
| A．contribute | B．devote | C．prefer | D．expose |
．Into the dark apartment____ , who was quite surprised when everyone shouted “Happy Birthday”.
| A．did David walk | B．David walked | C．David did walk | D．walked David |