No one knew what because of the thick fog.
| A．he had happened | B．had happened to him |
| C．had he happened | D．has happened to him |
–-You should be _______ careful when you take the chemistry exam.
---I agree. In this way, I will make _______ mistakes.
| A．more; less | B．more; more |
| C．less; fewer | D．more; fewer |
Tom is weak in physics. He always feels _______ before he takes a physics test.
| A．interested | B．comfortable |
| C．nervous | D．proud |
The second book ______I want to read is Business @ the Speed of Thought.
| A．which | B．that |
| C．what | D．as |
–There is _______ interesting book on the teacher’s desk. --Oh, ______ book is Wei Fang’s.
| A．an; the | B．the; the |
| C．the; a | D．a; the |
— Excuse me, but can I sit here?
— ________. The man who sat here says he will be back soon.
| A．Yes, please | B．You’re welcome |
| C．No problem | D．You’d better not |