the crowd? paniced? at the sound of the explosion.?

dedicate? ? dedicate? ? 奉獻

i? felt guilty? about not visiting my parents? more? ofter.

there past few years have been? a living hell.

correct

current? ? n.水流，氣流，趨勢

ritual? 習慣，禮儀

my office is well ventilated.? ventilate? 通風

efficient? ? 高效的

efficient? heating equipment? is necessary? for a harsh winter.