The best word to fill in the blank is "sleepy," as it describes a feeling that leads one to want to go to bed. Other options do not fit the context of expressing a current state of feeling. Thus, the full sentence reads, "I feel very sleepy. I'm going to go to bed!"
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For the sentence 'I feel very ____. I'm going to go to bed!', the most appropriate word choice from the given options would be 'sleepy.'
Here's why:
Meaning : 'Sleepy' means feeling ready to fall asleep or in need of sleep, which logically suggests why someone would decide to go to bed.
Context : The sentence implies that the person is experiencing a state of tiredness or fatigue that makes going to bed the next logical action. 'Sleepy' fits this context perfectly.
Other Options : Let's briefly look at why the other options don't fit as well:
'Nap' generally refers to a short sleep, not a feeling.
'Asleep' describes the state of being in sleep, not the feeling leading to it.
'Sleeper' is a noun, usually meaning a person who sleeps, which doesn't fit grammatically where an adjective is needed.
Therefore, the best choice is 'sleepy.'