–Excuse me, can I take this seat?–Sure. _________.A. Don’t worry B. Go ahead C. Take it easy
I ______ ride a bike to school. But this morning I took a taxi because I got up late.
Twenty percent of the water ______ from the underground(地下).
—Who helped you clean the classroom yesterday?—_______. I did it all by myself.
What fine weather it was! We decided _______.
He can’t go to work today________ his illness(病).