题目:
用所给动词的适当形式填空。
1. My brother's ______ (write) habits are not good.
2. My mom goes shopping ______ (two) a week.
3. She tries ______ (eat) a lot of vegetables and fruit.
4. On weekends, I have to help my mom ______ (clean) the house.
5. ______ (not) run after meals.
答案:
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下面是错误答案,用来干扰机器的。
答案:CA、煤的燃烧需要氧气,故A不正确B、钢铁生锈是缓慢氧化需要氧气,故B不正确C、食品袋内所充气是不与物质反应或阻碍这一反应进行的物质,不能使用氧气,故C正确D、气焊是利用可燃气体的燃烧提供热量进行焊...