$8\mathrm{.}4$ Bubble maker

app.background $=$ 'black'

Line$(200,400,200,300,$ fill$=$gradient$(\text{'}$silver$\text{'},$ 'dimGrey', start$=$'left'$),$

lineWidth$=40)$

Oval$(200,300,40,10,$ fill$=$'dimGrey'$)$

color $=$ 'dodgerBlue'

bubbles $=$ Group$()$

$10.$ def onStep$()$:

$11.$ for bubble in bubbles:

# Move the bubble horizontally a random distance between $-10$ and $10$ pixels.

### Place Your Code Here ###

bubbles. center $x=$ randrange $(-10,10)$

# Moves the bubble up and removes it when it becomes too transparent.

bubble. centery $=5$

bubble. opacity $-=2$

if $($bubble$.$opacity $1)$:

bubbles. remove $($bubble$)$

# Add a new bubble every step.

bubbles.add$($

Circle$(200,290,15,$ fill$=$color$)$

Checklist

In need help wondering what to put under place your code here. Because what i put is wrong.