张阿姨洗衣服，已知以下信息：
①洗衣机的洗衣缸内可容纳洗衣水（洗衣水指水与洗衣粉的混合液）和衣服共20千克；
②洗衣缸内已有衣服5千克，洁净牌洗衣粉两匙；
③每匙洗衣粉约0.02千克；
④每千克洗衣水中含有4克洁净牌洗衣粉洗衣效果最好。
问：要使洗衣水效果恰好，张阿姨还需往洗衣缸内加多少洗衣粉，添多少水？

实验室里做钠跟水反应的实验时，用到的仪器和药品是   （　）
①试管夹   ②镊子   ③小刀   ④滤纸   ⑤研钵   ⑥烧杯   ⑦坩埚   ⑧石棉网 ⑨玻璃片  ⑩药匙

Lucy： Hello, Mary, you look really tired. What's the matter?

Mary： I didn't go to sleep ____ midnight last night so I didn't get enough sleep.

Lucy： Sorry to hear that. Why don't you go to sleep ____ (early) tonight?

Mary： I hope so, ____ I have two after—school classes today. So I can only start ____ (study) after dinner.

Lucy： Maybe you should tell your parents ____ you can't do so many things.

Mary： I did, but they think it's important that I take more after—school ____ (class).

Lucy： Well, they ____ (possible) want you to get into a good senior high school.

Mary： Yes, I guess that's ____ reason.

Lucy： You should talk to your parents again. Explain that you need to get enough sleep to stay ____ (health).

Mary： That's a good idea. OK, I'll try to talk to ____ (they) again.