[R] enter "missing" into missing fields

[frenchcr]

if ive got an incomplete data set thats got thousands of rows and 80 columns
with random missing fields...like this say...

3 b 3
4    1
1 x 2

? how do i turn it into....

3    b       3
4 missing  1
1    x       2

...i.e., i want to insert a line of text like.."missing"... into the empty
fields ?
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