$#Hy$
$\text { 16, That building will be pulled down} $
$\text { 17, The exercises won't be correct tomorrow} $
$\text { 18, Dangerous chemicals have to be kept in the safe place} $
$\text { 19, The meeting had to be broken up} $
$\text { 20, That room may be used for the classroom} $
$\text { 21, Your hands must be washed} $
$\text { 22, The old building ought to be knocked down} $
$\text { 23, That report needn't to be typed today} $
$\text { 24, This room hasn't been used for ages} $
$\text { 25, That problem can't be solved} $
$\text { 26, The news was not told me} $
$\text { 27, The ending of the story was not told me} $
$\text { 28, A prize will be given her by the teacher if she works well} $
$\text { 29, A doll was bought her by her mother last week} $
$\text { 30, The robber was found by the police in the forest yesterday} $
