immediately /ɪˈmiː.diː.ət.li/ /ɪˈmiːdiətli/
urgently /ˈɜr.dʒənt.li/ /ˈɜːdʒəntli/
at once /æt wʌns/ /æt wʌns /
right away /raɪt əˈweɪ/ /raɪt əˈweɪ/