很多初二同学做完了形，凭“读着顺”就选，结果一对答案错一半。其实完形不是单纯考单词认不认识，而是考语境、搭配和逻辑。 今天用一篇“护牙与自信”的短完形，把10个常考空逐题拆开：哪些词是固定搭配，哪些空要看前后因果，哪些短语初中次次考。孩子自己看能懂，家长转存也能辅导。建议先让孩子做一遍，再对照解析，错处标红复盘，比盲目刷10篇更有效。
When you laugh, you’ll __1__ your mouth wide and let your teeth show. Believe it or not, the __2__ of your teeth can even influence影响 how confident you look. That’s __3__ healthy teeth do far more than just look good.
Strong teeth help you chew food well, which in turn helps your body __4__. They’re also the reason you can pronounce 发…的音words __5__ instead of mumbling.含糊地说某事，叽咕
But keeping them in shape takes more than a quick brush.
Brush __6__ — after breakfast and before bed. If you eat something sweet at noon, brushing after lunch works too.
Don’t rush. __7__ three minutes each time, or the back teeth get ignored.被忽视
Pick a soft-bristled 软毛brush. Ask your parents to replace it __8__, even if it still looks OK.
Try flossing绒毛. The first few times feel odd, but in a few weeks you’ll __9__ it. Flossing __10__ getting rid of 清除food your brush simply can’t reach.
. A. spreadB. openC. uncoverD. part
2. A. numberB. colorC. conditionD. shape
3. A. becauseB. howC. whenD. why
4. A. exerciseB. growC. digestD. develop
5. A. clearlyB. politelyC. fluentlyD. loudly
6. A. once a weekB. every other dayC. twice a dayD. two days later
7. A. At leastB. At MostC. At timesD. At first
8. A. twice a monthB. every three monthsC. each other yearD. every three weeks
9. A. get used toB. used toC. get intoD. be used to
10. A. suggestsB. avoidsC. keepsD. finishes
答案：
1. open
part 作动词是“使分开”，常接 lips（part your lips）；uncover 多指“揭开覆盖物”，不搭配 mouth。
2. condition
指牙齿整体健康状态，对应前文的healthier，比 shape / color 更准。
3. because
That’s because + 原因；That’s why + 结果。前句说现象，后句解释原因，用 because。
4. grow
逻辑链：嚼得细→ 吸收好 → 长身体。develop 偏能力/心智，digest 消化。
5. clearly
fluently 指“说外语流利”，这里指发音清晰，用 clearly；loudly 是大声，不是清楚。
6. twice a day
every other day = 隔天，是强干扰项。
7. At least
at most 是“最多”，逻辑反了；at times“有时”，at first“起初”，都不合语境。
8. every three months
“每三个月”固定表达，牙医常识题。
9. get used to
get used to doing = 渐渐习惯做（本题）
be used to do = 被用来做
used to do = 过去常常做
10. keeps
flossing 是动名词作主语，谓语用三单。keep doing = 持续做；avoids 逻辑反，finishes 表示“做完”不符“持续清理”。
1.B 2.C 3.A 4.B 5.A 6.C 7.A 8.B 9.A 10.C
以上10个空，基本覆盖了初二完形常考的“动词搭配＋因果连词＋习惯表达＋常识逻辑”。建议把这篇收藏起来，让孩子先做后看解析，错题抄到笔记本上，每周复盘一次。
