of the surface of the earth covered with water.
| A．Seven-tens...are | B． Seven-tens…is |
| C． Seven-tenths...is | D．Seven-tenths...are |
Mr. Lee looks pale. After all, he has lost lots of ________ in the accident.
A. drugs B. blood C. support
The street is so dirty that we can see litter ________.
A. everywhere B. somewhere C. nowhere
-- Thank you for giving me so much help!
-- ________
A. It’s a pleasure.
B. It doesn’t matter.
C. It’s fun.
The air pollution is serious, ________ we must try our best to reduce it.
A. so B. or C. if
--The river used to be clean. How does it become dirty?
-- There are many factories ________ waste water into it.
A. pouring B. pour C. poured