An independent clause that contains a subject anda predicate showinga complete thought is..

A simple sentence.

Explanation:

An independent clause is the type of clause that contains all the necessary details like a subject and a verb to make a complete sentence. In other words, an independent clause has both subject and predicate in it.

An independent clause is also known as a simple sentence as it can stand alone and make a thought complete. This means that an independent clause and a simple sentence are the same, considering they both can stand on their own as a complete sentence and does not need any addition to be complete.

it translates into:

read the letter of your pen pal. write and answer 3 questions.

pretty sure 1.someone's coat was found in the lobby.