Какие предлоги надо поставить в предложениях 1)if there is any doubt ... a piece of...

Question

Какие предлоги надо поставить в предложениях
1)if there is any doubt ... a piece of equipment do not use it
2)care should be taken whenentering ... the enclosed spaces
3) ensure that the machine is ... good condition
4)the work is ... progress

Answer 1

1. If there is any doubt about a piece of equipment...

2. Case should be taken when entering the enclosed spaces.

3. Ensure that the machine is in good condition.

4. The work is in progress.