A horse is _______ useful animal.

I always make mistakes in my math exams. What should I do? –I think you should be _________.

Did you notice him come into the hall?— Sorry, sir. I _______ with my friends online.

_______ will you stay there?—A week.[ ]

Our school is going to hold the ________ Culture Festival. —Yes! And we can take part in ________ activities.