I ______ ride a bike to school. But this morning I took a taxi because I got up late.
| A．never | B．sometimes |
| C．hardly ever | D．usually |
Twenty percent of the water ______ from the underground(地下).
| A．is | B．come | C．be | D．are |
—Who helped you clean the classroom yesterday?—_______. I did it all by myself.
| A．Someone | B．Anyone |
| C．Everybody | D．No one |
What fine weather it was! We decided _______.
| A．to not go out | B．not to go out |
| C．to go out | D．going out |
He can’t go to work today________ his illness(病).
| A．because | B．because of |
| C．but | D．and |