Select the most appropriate option to fill in the blank.

Anita looked ______ the word in the dictionary, but she still did not understand it.

up

The most appropriate option to fill in the blank is up.

The word up means to look for something in a reference book. In this case, the sentence is saying that Anita looked up the word in the dictionary, but she still did not understand it. This means that she looked for the word in the dictionary, but she was still unable to understand its meaning.

The other options are not correct.

• To does not make sense in this context.
• From does not make sense in this context.
• After does not make sense in this context.