--I have been working hard at math. However, I can't get good marks in the exam.--Go on studying hard. And I think your dream will
—What color ____ your ____, Mike? —Black.
____ bikes are red.____ are blue.
—Can you give this book ____ Jack? —Yes, I can.
—Please ____ him find his bike. —OK.
—Is Christmas ______ December 25th or 26th ? —25th, I think.