1) have to
2) have to
3)does not have to
4) has to
5) have to
6)Do not have to
7)do not have to
8)have to
9)does not have to
1 a are produced
2 a is wasted
3 a aren't allowed
4 b let him
5. b Does
6 a are not found
7 c are designed
8 a is eaten
9 b don't let her