【填空题】Human languages are known as natural (1). Unfortunately, (2) are not sophisticated enough to (3) natural languages. As a result, we must (4) with computers using (5) computer languages. There are many different (6) of computer languages, including (7) languages, programming languages, and (8)-generation languages etc. Machine languages the lowest (9) programming language. They are the only languages understood by computers. While easily understood by computers, machine languages are almost impossible for (10) to use because they consist entirely of numbers.