Exam 010-160 topic 1 question 68 discussion

The file script.sh in the current directory contains the following content:
#!/bin/bash
echo $MYVAR
The following commands are used to execute this script:

MYVAR=value -
./script.sh
The result is an empty line instead of the content of the variable MYVAR. How should MYVAR be set in order to make script.sh display the content of MYVAR?