7. You must not touch this button while the experiment is in progress.
This button must not be touched while the experiment is in progress.
8. We should call the police at once after the accident.
The police should be called at once after the accident by us.
9. We must put an end to this quarrel.
This quarrel must be put an end to
10. You shouldn't make fun of the poor.
The poor shouldn't be made fun of.

7. this button must not be touched while the experience is in progress.
8. the police should be called at once after the accident by us.
9. this quarrel must be put an end to.
10. the poor shouldnt be made fun of.

7. You must not touch this button while the experiment is in progress.
This button must not be touched while the experiment is in progress.
8. We should call the police at once after the accident.
The police should be called at once after the accident by us.
9. We must put an end to this quarrel.
This quarrel must be put an end to
10. You shouldn't make fun of the poor.
The poor shouldn't be made fun of.