All my friends came to my birthday party. That _______me very happy.

Who are you going _____?—My parents.[ ]

How often do you go skating?——________.I can’t skate at all.

Look at ______ book on the desk . Is it ______ useful one ?—Yes, it is . In the book there is much advice on how to learn math well.

_____do you send an e-mail to your cousin? —Sometimes. [ ]