$6.$ I was advised to sell that house.
$7.$ We were begged to help them
$8.$ It is ordered that the floor be cleaned
$9.$ It is recommended that the job be done
$10.$ He is urged to visit her parents as soon as possible .
$11.$ Your name and your address must be written down
$12.$ It musn't be done again
$13.$ Your hat must be taken of
$14.$ Let her be told
$15.$ You mustn't be seen by others
$16.$ He wants to have these letters posted.