The correct subordinating conjunction is "yet" and the sentence is completed as follows:
Mandy practiced karate every day, yet she failed to beat her final opponent.
The word "yet" is a subordinating conjunction that means "nevertheless" or "however", it is associated with negative statements in order to mention that an event did not take place.
In this sentence, it explains that even though Mandy had practiced she did not beat her opponent.
There is no period at the end of the sentence
- I accidentally cut my finger with the knife when I was cutting tomatoes.
- I asked my neighbor if he could cut the rope for me.
- Placing it in a plate, he cut it up in small pieces .
- He yelled, and I felt the knife cut deeper into his skin.
- I almost cut the entire section of the book.
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