()4. They're cleaning the .

A.bedroom
B.classroom
C.house

C

观察配图，图中是带有沙发、餐桌的居家室内场景，三人正在打扫家中。A选项bedroom意为卧室，B选项classroom意为教室，均不符合图中场景，C选项house意为家/房屋，符合题意。

三、根据下面的情境，使用“You should...”写出合理建议。
1. My eyes are tired. What should I do?
建议：
2. I have a bad tooth. It's painful. What should I do?
建议：

1. You should close your eyes and have a good rest to relax your eyes.
2. You should go to see the dentist and not eat too much sweet food.

本题考查"You should..."提建议句型的实际运用，需要结合对应的生活场景，写出语法正确、符合常理的合理建议，答案不唯一，符合情境要求即可。

()1. You shouldn't eat too much honey. It's not good for your .

A.tooth
B.tooths
C.teeth

C

首先，tooth是单数名词，它的复数是不规则变化，不存在tooths的错误写法，先排除B选项。该句表达吃太多蜂蜜对牙齿不好，这里指代的不是单颗牙齿，要用复数形式，A选项的tooth是单数不符合语境，C选项的teeth是tooth的正确复数形式，符合题意。

()2. Kevin is today. He stays at home and watches TV all day.

A.free
B.busy
C.rest

A

根据后半句“他整天待在家里看电视”，可知Kevin今天是空闲的。is后需接形容词作表语，A.free意为空闲的，符合语境；B.busy意为忙碌的，和后半句内容矛盾；C.rest是动词或名词，不能放在is后作表语，不符合语法。所以选A。

()3. —How can I take care of my teeth?
—

A.You should eat three meals a day.
B.You should sleep nine hours a day.
C.You should brush your teeth for more than two minutes each time.

C

问句询问保护牙齿的正确做法，A选项一日三餐、B选项每日睡九小时都和护牙无关，C选项每次刷牙超过两分钟是正确的护牙方式，符合题意。

二、选择合适的句子补全对话。
Doctor: 1.
Mike: I have a bad toothache. I can't eat any food.
Doctor: Let me check your teeth.
Mike: OK!
Ten minutes later.
Doctor: 2.
Mike: Oh no. What should I do?
Doctor: Don't worry. 3.
Mike: 4.
Doctor: No. Just take the medicine and take good care of your teeth.
Mike: 5.
Doctor: You should brush your teeth twice a day carefully and eat less sweet food.
Mike: OK! Can I drink juice?
Doctor: 6.
Mike: I see. Thank you so much.
Doctor: You're welcome.

1. D
2. B
3. A
4. F
5. C
6. E

我们可以根据对话的上下文逻辑匹配选项：
1. 空后Mike回答自己牙疼、没法吃东西，可知医生是在询问Mike的身体状况，对应选项D。
2. 空处在医生检查完牙齿之后，Mike听完后表示惊讶并询问该怎么做，可知医生是告知Mike他的牙齿出了问题，对应选项B。
3. 空处前医生安慰Mike别担心，接下来给出对应的治疗医嘱，对应选项A。
4. 空处后医生用No作答，说明Mike的句子是一般疑问句，对应选项F。
5. 空处后医生详细说明了护理牙齿的方法，可知Mike是在询问如何护理自己的牙齿，对应选项C。
6. 空处前Mike询问自己能不能喝果汁，医生给出对应的答复，对应选项E。