Last week our school held a sports meeting. Everyone in our class felt very 1 because we 2 many matches. In the boys' relay race, Michael3 very fast and our class won the first place. Alice did well 4 the long jump and she also won. We're sorry that we did 5 in the high jump than other classes, but we're sure we could do better next time. I took part in the boys' 6 race. I did my best and was the first 7 the finish line. This encouraged 8 a lot. Now I love sports better and I think nothing makes me9 than taking exercise everyday and I believe some day I 10 able to be the best soccer player and take part in the Olympic Games.

Tina began to practise the piano ____ ____ ____ ____.

地球公转至乙位置时为北半球的____（节气），此时，我们居住的小区房间内能够被太阳光照射到的面积为一年中的____（最大、最小）值，北京的昼长达到一年中的____（最大、最小）值。

兰州牛肉面制作中通过添加蓬灰（主要成分K₂CO₃），使面条劲道有弹性．下列关于K₂CO₃的说法中不正确的是（　　）

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