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Topic.
"What are you investing in?"
Stranded Preposition. Wh-Question + in
What + invest + in
Similar to:
What are you interested in?
Im interested in taking Piano lessons.
What do you need to take in?
I need to take in my Physics problems, I haven't got quite yet.
What are you pitching in?
Im pitching in planting plant across the neighborhood.
Vocabulary.
Lose one's shirt
"To lose one's shirt" Is an expression to say:
Go broke / Lose everything of value / Under financial ruin