half an hour ___(pass) since the train __(leave)

It takes them half an hour by bus.变为The___ ___ takes them half an hour. I spent half an hour ___(finish) my homework. half an hour ___(pass) since the train __(leave) a half hour还是half an hour? 是half hour还是half an hour? half an hour or a half hour? half an hour later half an hour造句 Half an hour. half hour =half an hour half hour half an hour 的意思有和区别? I spent half an hour arriving at the top of the mountain.同义句___ ___ me half an hour ___ ___ to the top of the mountain . She practises speaking English for half an hour every time/(___ ___)每次 另一种 our school is abot half an hour by bike___ ___ is your shool 对提问 an hour and half还是an hour and a half half an hour or hour中文 after half an hour.是什么意思 half an hour? 什么意思? Half an hour =什么?