Your heart starts beating before you are born and keeps right on going through your whole life. Over an average lifetime, the human heart beats more than 2.5 billion times. Keeping your heart healthy means eating right, not smoking, and...

How many calories are in your favorite foods? How much exercise would you have to do to burn off these calories? What is the relationship between calories and weight? Explore these issues by choosing diet and exercise and keeping an eye...

See how exercise affects human health.

Everybody knows that your body needs oxygen to keep going, and that you breathe out carbon dioxide as waste. What happens when you exercise? You've probably noticed that you breathe faster, and your heart beats faster. What triggers your...

This is a 10-question, self-grading quiz/exercise over Simple Subjects and Simple Predicates.

This is a 10-question, self-grading quiz/exercise over Simple Subjects and Simple Predicates.

This is a 10-question, self-grading quiz/exercise over the Verb Expansion Rule.

This is a 10-question, self-grading quiz/exercise over the Verb Expansion Rule.

This is a 10-question, self-grading quiz/exercise over the Verb Expansion Rule.

This is a 10-question, self-grading quiz/exercise over the Verb Expansion Rule.

This is a 10-question, self-grading quiz/exercise over the Verb Expansion Rule.

This is a 10-question, self-grading exercise/quiz on the use of Semicolons.

This article focuses on journal writing including the benefits, goals for parents and teachers, materials needed, journal exercises, and teaching kids how to keep a journal.

This is a 10-question, self-grading quiz/exercise over Simple Subjects and Simple Predicates.

This is a 10-question, self-grading quiz/exercise over Simple Subjects and Simple Predicates.

This is a 10-question, self-grading quiz/exercise over Simple Subjects and Simple Predicates.

This is a 10-question, self-grading exercise/quiz on using Idioms to replace the given word or phrase. It is suitable for ESL as well as regular English classes.

This is a 10-question, self-grading exercise/quiz on using Idioms to replace the given word or phrase. It is suitable for ESL as well as regular English classes.

This is a 20-question, self-grading quiz/exercise on Distinguishing between Adverbials, Adjectivals, and Nominals.

This is a 20-question, self-grading quiz/exercise on Distinguishing between Adverbials, Adjectivals, and Nominals.

This is a 20-question, self-grading quiz/exercise on Distinguishing between Adverbials, Adjectivals, and Nominals.

This is a 20-question, self-grading quiz/exercise on Distinguishing between Adverbials, Adjectivals, and Nominals.

This is a 20-question, self-grading quiz/exercise on Distinguishing between Adverbials, Adjectivals, and Nominals.

Grammar, vocabulary, and spelling quizzes and practice exercises designed for students learning English as a second language. Activities are interactive, and users receive immediate feedback.