suddenly

lost, lucky, rained

It suddenly rained so hard that we had to cancel the outdoor picnic.

brake, don't, stopped, train

The train stopped suddenly when the driver saw a person on the tracks.

heavens, jim, middle, weight

The weight of responsibility suddenly fell on her shoulders when her father became ill.

in, out, up

The dog suddenly bolted out of the house and ran down the street.

recently

I was doing fine until recently, then suddenly everything fell apart.