6. You mustn't touch this button while the experiment is in progress
->This button mustn't be touched while the experiment is in progress
7. Someone will blow a shistle if there is an emergency
->A shistle will be blown if there is an emergency.
8. Did people make jeans two hundreds years ago ?
->Were jeans made two hundreds ago?
9. We don't use this kind of cloth to make shirts
->This kind of clothes isn't used to make shirts.
10. You should pay your bill before you leave the hotel
->Your bill should be paid before you leave the hotel