Problem: How does the next paragraph end?

Several people are standing in a gym. An instructor stands on stage and leads them in an exercise. they
A: dance in place as part of the exercise.

Problem: How does the next paragraph end?

How to thresh and winnow 
Choose a good day. 
Choose a day when there isn't much wind and when it is dry. Don't try to do this when it's raining, windy, or muddy.
A: Lay a clean tarpaulin down on the ground. Do this near where you plan to cut down the relevant plants.

Problem: How does the next paragraph end?

How to write a trading plan 
Decide which financial instruments you will trade. 
You may be strictly a stock or currency trader, or you may be trading multiple markets. Create a separate category in your trading plan for each financial instrument.
A: Determine which stocks, currencies or other financial instruments to trade. For example, you may be interested in a few company stocks.

Problem: How does the next paragraph end?

How to make parmesan crisps 
Preheat your oven to 400 ° f (205 ° c) and line a large baking sheet with parchment paper. 
You can also use a silicone baking sheet instead. 
Place a tablespoon-sized mound of parmesan cheese onto the baking sheet.
A:
Try to use coarsely-grated parmesan cheese; it will look more like shredded parmesan. Avoid using the powdery, finely-grated parmesan cheese.