Below is an example of the dataset (for some reason the columns are not lining up with the variables). Basically want to replace all missing values with nonmissing values in each of the variables below. In my real dataset I have over 200 variables like these. I've tried various replace commands, but cant get it to work quite right for some reason. Thanks!

Code:
It looks like this:
v1 v2 v3 v4 v5
. . .  . .
. 8 .  . .
5 . 3  . 6
. . .  . .
. . . 10 .

I want it to look like this:
v1 v2 v3 v4 v5
5 8 3 10 6
5 8 3 10 6
5 8 3 10 6
5 8 3 10 6
5 8 3 10 6