Look at ______ book on the desk . Is it ______useful one –Yes, it is . In the book there is much advice on howto learn math well.

We really shouldn’t use paper napkins, you know.– I know. I stopped _____ last year.

Visitors to the National Museum can avoid long lines at the ticket booths by purchasing tickets ____

I failed the exam ________ I did my best. But I’ll try harder next time.

The judge paid no attention to ______ he had just lost his wife