Cold wave has come up a few times. In the UK we'd say 'cold spell' and never wave
Cold spell is always accepted.
YOU REALLY DON'T NEED THE THREE DOTS UNDERNEATH LIKE HONESTLY NO ONE USES THEM IN ISRAEL I SWEAR
I'm sure the people who made this course know that: they have put them there for us learners so that we don't mistakenly read it as "kashah".
Acharei gal ha'kor ein safek she'yihye choref kashe.