( ) Even the top students in our class can’t work out this problem. So it _____ be very difficult.
She ________ an English book. A.have B.has
—What ________ Lingling have? —She has a ball. A.do B.does
—What do you ________ at school? —I have classes. A.do B.does
—________ —No,I don't. A.What do you do on Sundays?B.Do you go swimming on Sundays?
—________ —Yes,he does. A.Does he watch TV?B.Is he watching TV?