单词填空,来帮个忙~Exhale completely to ____that no air is left in your lungs so that you can breathe in more airBlowing up balloons is an _____way to achieve the same effectPlaying an instrument is____in expanding your lung capacity

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单词填空,来帮个忙~
Exhale completely to ____that no air is left in your lungs so that you can breathe in more air
Blowing up balloons is an _____way to achieve the same effect
Playing an instrument is____in expanding your lung capacity

1.carbon dioxide
2.shortcut
3.Saxophone

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