Make sure you have the links below in your /etc/apache2/mods-enabled dir:

ubuntu@ip-xxx:~$ ls -l /etc/apache2/mods-enabled | grep php7.0
lrwxrwxrwx 1 root root 39 Feb  4  2017 php7.0.conf -> /etc/apache2/mods-available/php7.0.conf
lrwxrwxrwx 1 root root 39 Feb  4  2017 php7.0.load -> /etc/apache2/mods-available/php7.0.load

Restart apache (with apache2ctl restart) after you create the links