_____ private cars bring us convenience, they also cause more traffic accidents and pollution.
| A．While | B．As | C．If | D．Since |
--Come on, please give me some ideas about the project.
--With so much work filling my mind, I almost ______.
| A．break in | B．break out |
| C．break down | D．break off |
Only when I woke up______ what had happened.
| A．I knew | B．I did know |
| C．did I know | D．had I known |
The weather turned out to be very good, _________ was more than we expected.
| A．which | B．what | C．that | D．this |
Look out! Don’t get too close to the house _________ roof is under repair.
| A．which | B．whose |
| C．of which | D．of that |
The English play _________ many students are preparing at the New Year’s party will be a great success.
| A．for which | B．at which |
| C．in which | D．on which |