当混合气体中瓦斯浓度大于16%时,仍然会燃烧和爆炸
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Hegraduatedfromcollege________hisparentsdivorced.
—Youwerebraveenoughtoraiseobjectionsatthemeeting.
—Well,nowIregret________that.
PoorspeakerofEnglishthoughhewasatthetime,hestillmanagedtomakehimself________.
Heboughtahouseforhischildren________
He________violinwhenIwanttosleep.