The boys ____ climbingup the ______ cliff,but decided it was too dangerous.

(A) asecended....lethal
(B) contemplated....sinister
(C) endured....mundane
(D) simulated....dreary
(E) declined....obscure

B

The boys contemplated climbing up the sinister cliff but decided it was too dangerous.

Contemplated means to "think through" and sinister is the equivalent of unfavorable

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To answer this question, we need to understand the meaning of the words and choose the most appropriate options.

First, let's look at the context of the sentence. The boys began an activity but stopped because they considered it too dangerous. We are looking for two words to fill in the blanks.

Now, let's analyze the options:

(A) "asecended....lethal": The word "ascended" means to go up or climb. However, "lethal" means deadly or causing death. Both the words don't seem to fit in the context of the sentence.

(B) "contemplated....sinister": "Contemplated" means considered or thought about. "Sinister" means dangerous or ominous. This option seems to fit the context, as the boys considered the activity but decided it was too dangerous.

(C) "endured....mundane": "Endured" means to suffer or tolerate. "Mundane" means ordinary or dull. These words don't seem to match the situation described in the sentence.

(D) "simulated....dreary": "Simulated" means imitated or pretended. "Dreary" means gloomy or depressing. Neither of these words fits the context.

(E) "declined....obscure": "Declined" means refused or said no to something. "Obscure" means unknown or not well-known. This option seems to be a good fit, as the boys declined climbing up the cliff because they found it too dangerous.

Considering all the options, it appears that the best choice is (E) "declined....obscure."

Therefore, the correct answer would be:
The boys declined climbing up the obscure cliff but decided it was too dangerous.