---Look! Such heavy traffic!--- I doubt _________ or not I can get to school on time.
Jenny’s teeth are not good, because she ____.
—I lost my MP3 on my way to school this morning. —____ You must be careful next time.
Our English teacher is often pleased ____ what we do in class.
When you have some difficult math problems, you can ____ your math teacher.
She didn’t sing the song ____ at the party last night.