It seems that ________ is no set amount of time that everyone needs to sleep each night.

• A. There
• B. Like
• C. Although
• D. When

Answer: (A)

The idea being tested is using there to express existence. After a phrase like “It seems that,” English often continues with a clause that has “there is/there isn’t” to state what exists or doesn’t exist. In this sentence, the natural choice is the word that starts the clause “there is no set amount of time,” because you’re saying that no fixed amount of sleep applies to everyone. So the full sentence reads: “It seems that there is no set amount of time that everyone needs to sleep each night.”

The other words wouldn’t fit here. “Like” isn’t used to introduce the idea of existence in this structure, and “although” would require a different arrangement with a contrasting idea, not a simple existence claim. “When” would introduce a time clause and doesn’t work with the meaning of the sentence.