The answer is your first option: Jason and Mary were so hard to complete the project, considering it was so late at night.
D
This sentence combines all of the original thoughts: the experience was bad, the subject was babysitting their neighbor’s two-year-old, and they almost lost them.
I would say A, as they refuse to eat food.
C,<span>One of Tennessee Williams's plays is </span>Cat on a Hot Tin Roof<span>.
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Hitting the water with an awkward belly-flop, Roland splashed everyone sitting by the pool.