(六)         It’s helpful for our earth to avoid wasting water, but it’s not enough. We also need to use our water in smarter ways. Here are some tips for you. Do you grow plants? Try watering them during the night or evening. That way, the sun won’t dry the water before your plants use it. Don’t leave the water running. Turn the faucet off when you start brushing teeth or doing dishes. Also, don’t wash your car by hand. Try taking it to a professional car wash. They’ll do a great job, and they’re experts at saving water. After all, it saves them money and it is important for our Earth. Not only that, but you’ll get cheaper water bills.* avoid 避免 faucet水龍頭 professional專業的 experts專家
【題組】29. What’s the main idea of the passage? 
(A) Why some people waste water.
(B) How to grow plants at night.
(C) Why using water wisely is helpful.
(D) How to wash cars by yourself.