1. Schools should do something to help students protect _______ . 2. If a river is ___ __ , farmers can’t use the water for their crops. 3. The Internet is more _ ____ than books. It is influencing our lives a lot. 4. The students who are good at writing can always use words ______ . 5. Children usually attend a primary school at the age of _____ in China.
答案:1.themselves 2. polluted 3. powerful 4. properly 5.six