A competent speaker of a language must have a(n)________ of these different styles.
| A．comment | B．observation | C．command | D．response |
You could have watched the movie Transformers 3 last night．Why _____ you?
| A．didn’t | B．haven’t | C．hadn’t | D．shouldn’t |
After the flood, what the local government did first was to provide _____ for the homeless families．
| A．furniture | B．occupation |
| C．equipment | D．accommodation |
Li Gang, a police officer said that little about what his son _____ he know the moment all the media reported the traffic accident _____ in Hebei University．
| A．did did; happening | B．did do; happened |
| C．would do; happening | D．could do; happened |
It’s not necessary to explain the truth _____ there is spring wind, there is green grass．
| A．which wherever | B．that which |
| C．which when | D．that wherever |
—Are you going to stay overnight?
—Not _____ it’s really necessary．
| A．unless | B．if | C．until | D．since |