The old town has narrow streets and small houses ________ are built close to each other.[ ]

Don’t _____ music in class!

Whose book is this—It ________be Mary’s. J. K. Rowling is her favorite writer.—No, it ______ be hers . She never brings novels to school.

Lily would rather I _______ her at the airport yesterday, but I was then busy with a meeting.

I don’t like the days. I can’t go out to play football with my friends.