Topic: Group verb,

Best Answer Explained in Below-:

The correct answer to the sentence "Please look ______ these papers." is A) over. The phrase "look over" means to examine or review something in a cursory manner, which fits perfectly in the context of assessing papers. When someone asks you to "look over" a set of documents, they are typically requesting you to read through them quickly to get a general understanding or to check for any important details, errors, or highlights.

Let’s briefly analyze the other options:

B) “look up” usually implies searching for information, as in looking for definitions or finding data in a reference. This does not fit the context of examining papers.

C) “look on” is generally used to describe a passive interaction where one observes something happening, without directly engaging with it, which also doesn't suit the idea of reviewing papers.

D) “look at” suggests a more passive or direct observation without the implied thoroughness of examination that "look over" conveys.

Thus, "look over" is the most appropriate phrase that encapsulates the concept of reviewing or checking papers quickly and effectively.