Improve the highlighted part of the sentence given below.
Taxpayers $are\, to$ be conscious of their privileges.

Improve the highlighted part of the sentence given below.
$If\, the\, room\, had\, been\, brighter,$ $I$ would have been able to read for a while before bedtime.

Improve the highlighted part of the sentence given below.
Why the dinosaurs died out $is\, not\, known.$

Improve the highlighted part of the sentence given below.
John $had\, told$ me that he hasn't done it yet.

Improve the highlighted part of the sentence given below.
$I$ will not go to school,if $it\, shall\, rain\, tomorrow.$

Improve the highlighted part of the sentence given below.
More than one person $was\, killed$ in the accident.