Personally, I would address the problem, explaining to your audience that you've lost your "train of thought" from there, make fun of the situation, say "let's see, where was I?" * recieve an answer from audience * then continue one.
To sum it, make fun, and a light hearted joke about it, and continue to your best ability.
Answer:
C
Explanation:
The topic sentence tells you what the paragraph is going to be all about.
I don't know what the original sentences looked like, but I assume the answer is :
C) That ancient land was located in the Middle East, a hot and sunny part of the world.
Answer:
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Answer: Kinetic energy
Explanation: Kinetic energy is the energy of motion. The gumballs at the top of the machine have potential energy.