---Why does the lake smell terrible?
---Because large quantities of water ________.
A. have polluted B. is being polluted
C. has been polluted D. have been polluted
The girl came ___________to the bus stop，only ________ the bus had gone.
A. running; to find B. to run; to find
C. and run; found D. running; finding
That guy kills his time by playing PC games day and night. I wonder whether he could find anything________ at all.
A. worth to do B. worth doing
C. worthy being done D. is worth to be done
—Do you feel like there or shall we take a bus?
—I’d like to walk, but since there isn’t much time left, I’d rather we a taxi.
A. to walk; take B. walking; took
C. to walk; took D. walking; take
Upon hearing the news of her dad's passing, she was ______ with grief.
A. arrested B. overcome
C. frightened D. modified
--Mark, I failed in the exam again, I’m so upset.
--Don’t worry, I think the first thing ______ is ______ your weak points.
A. to do, find out B. being done, to find out
C. to do, to hold out D. being done, hold out
