—The air pollution is terrible.— It will be worse ________ we take action to protect the environment.
—Do you think it is _____ to write an English essay? —Yes, you can do it ______ if you practice more.
The MP3 _____ too much .He ____ 200 yuan _____ it .
—I am trying my best to learn English, but it doesn’t work well! —Don’t worry! Regard it _____ a big challenge!
I had a little trouble English grammar.
—How do you improve your listening skill, Mary? —I often do it _________ tapes and English radios.