The correct phrase is "kept mum." This means to stay silent or keep a secret.
If you mean what is an aeroplane kept in then it is kept in hanger but where does aeroplane is kept does not make sense
The past tense of kept is "kept."Past: keptPresent: keepFuture: keep
They were kept in there for there safety. They were kept in there for there safety.
If you mean what is an aeroplane kept in then it is kept in hanger but where does aeroplane is kept does not make sense
Kept is the past tense of keep. The past perfect tense is had kept.
It is also 'kept'.
kept in touch with
Where is coal kept
It is kept at home and in the mosque. There is no particular place reserved for it. It may be kept in a car. It must be kept with reverence.
they kept control
water is kept in a cistern