They were speaking in such a low voice that I couldn’t ______ what they were talking about.

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are speaking is speaking were making a speech have a speech

but could not talk instead of speaking rather than speak and not speak

was；has coached　 were；have coached was；have coached　 were；has coached

don't know; are speaking don't know ;were speaking didn't know; were speaking didn't know; are speaking

speaks is speaking spoke will be speaking

Generally speaking Believe it or not To my surprise To be honest

Generally speaking On the contrary To be honest As a result

did they speak were they speaking are they speaking have they been speaking

is are was were

don’t know; are speaking don't know; were speaking didn't know; were speaking didn't know; are speaking

talking whispering speaking telling

did they speak are they speaking were they speaking had they spoken

of speak to speak speak to speaking

speak to speak speaking spoken

adapted appealed addicted applied

Generally speaking On the contrary To be honest As a result

cut in cut up cut down cut off

hung up hung back cut down cut off