Thirty m____ is half an hour

Thirty m____ is half an hour Tirty m____ is half an hour.应填什么啊? thirty minutes_____ (be)half an hour 根据首字母完成句子 Half an hour is thirty m _____. half an hour later she woke up.还有这half an hour为什么等于thirty mi The school is _____ A.half an hour B.half an hour's half an hour later half an hour? 是half hour还是half an hour? half an hour or a half hour? a half hour还是half an hour? half hour =half an hour