(    )21£®—Listen !Tom _________ now. —Oh ,he always_____________.

        A£®is singing£»is singing          B£®is singing ;    sings

C£®sings; is singing             D£®sings; sings

(    )22. My classroom is __________ the teachers’ office.

A£®next to        B£®on         C£®next       D£®between

(    )23. There __________ a dog and two cats under the tree