科学课上，小明测出了鸡蛋各部分的质量，并制成了扇形统计图，根据统计图填空。一个鸡蛋中蛋黄的质量约占（ ），蛋壳的质量约占（ ）。若一个鸡蛋重50克，那么这个鸡蛋中的蛋白约重（ ）克。
-- Will you buy this nice camera, Henry? -- No. It’s too expensive. I can’t ________ it.
Teenagers are supposed to ________ their seats to the old on bus.
-- Where is Paul, do you know? -- He ________ the library. He won’t return until nine.
-- Coffee or tea? -- _______. Just a glass of water.
-- Never ________ today’s work till tomorrow. -- Yes. It’s a good habit.
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