Because it was raining ,we cancelled the trip. The trip was cancelled____ _the rain
The trip was cancelled because of the rain.
This is a more natural way to say it than “The trip was cancelled _the rain”. The word “because” is used to show the cause and effect relationship between the two clauses.
Another way to say it would be “The trip was cancelled due to rain”. This is also a correct and natural way to say it, but it is a bit more formal.
I hope this helps!