1 (completed action marker)

2 (modal particle indicating change of state, situation now)

3 (modal particle intensifying preceding clause)

1 oneself

2 one's own

1 to understand

2 to realize

3 to find out

1 to come from (a place)

2 From: (in email header)

1 to go out somewhere (relatively short trip)

2 to set off on a journey (longer trip)

1 obstinately clinging to one's course (idiom)

2 willful

3 one's own way

4 dogmatic

1 obvious at a glance (idiom)

1 obvious at a glance (idiom)

1 ten lines at a glance (idiom)

2 to read very rapidly

1 lit. a piece of rat feces spoiled the whole pot of congee (idiom)

2 fig. one bad apple can spoil the whole bunch