!:n-m
A range of words, from the nth to the mth, inclusive.
Between grabbing one word and grabbing them all, the range: !:1-2 brings the first and second arguments, !:2-4 brings the second through the fourth.
The endpoints have nicknames — 0 is the command, $ is the last word — so !:0-$ is the whole line and !:2-$ is the same as !:2*.
$ scp relatorio.pdf anexo.pdf estufa:/docs/
$ tar -czf docs.tar.gz !:1-2
tar -czf docs.tar.gz relatorio.pdf anexo.pdf