The police were seeking more information to find out_______the rich merchant．
| A．who it was that killed | B．who was it that killed |
| C．it was who killed | D．who was it killed |
Because of Einstein’s Theory of Relativity, scientists never again regarded the world___________.
| A．as before they did | B．as they regarded before |
| C．as they did before | D．as they had before |
--- Hurry up. The bus is coming.
--- Oh, no. We mustn’t cross the street___________the traffic lights are green.
| A．until | B．since | C．while | D．after |
Sorry, you lost your purse; I hope it will___________some day.
| A．turn out | B．show off | C．show up | D．turn up |
A brilliant idea occurred to him, ___________to his research in the lab.
| A．while devoting | B．while devoting himself |
| C．while he was devoted | D．while devoted |
Father doesn’t know Jack has been gambling; if he found out, I think he___________him out.
| A．will drive | B．must drive | C．drove | D．would drive |