How can i run specific lines from a file as commands in the shell?

I am basing my question on the thread here: How can I run a specific line as a command in a text file?

How do I run a set of lines from the the text file?

Here's what I have tried so far:

Input file:
      1 #!/usr/bin/csh -v
      2
      3 date
      4
      5 echo "abc"
      6
      7 set cell="bananas"
      8
      9   set cmd = "echo apples \
     10               oranges \
     11               graped $cell"
     12
     13 echo $cmd
     14

sed -n '5,13 p' /tmp/1 | sh

gives:

abc
(blank line)

Why doesn't this execute the rest of the lines? Or as I suspect, is it running it but not giving any output since these commands are run in a new? sh(ell) everytime and not in a single shell session?

Thanks!