Nowadays, most people，in order to keep fit，prefer walking to driving ____necessary.
| A．if | B．unless | C．in case | D．as if |
--I'm told that John had another car accident this morning.
--I believe not. He _________so careless.
| A．shouldn't have been | B．wouldn't have been |
| C．couldn't have been | D．mustn't have been |
The Bunsen Burner is so named because it is thought ___________ by Robert Bunsen.
| A．to be invented | B．having been invented |
| C．invented | D．to have been invented |
--I didn't know this was a one-way street, officer.
| A．That's all right. | B．I don't believe you. |
| C．How dare you say that? | D．Sorry, but that's no excuse. |
--Which play shall we go and see?
----____________________.
| A．I'm afraid we can't | B．I don't think it's interesting |
| C．Yes, I quite agree with you | D．I'll leave it to you |
You _________think you're clever, but that doesn't give you the right to order me about!
| A．should | B．would | C．could | D．might |