(   )21.Tom likes to play____ violin in the morning and play ____ volleyball in the afternoon.

A. the, the  B. the,/   C. / the,   D. /,/

(   )22. Lao Zhang __________ Beijing opera every morning. Listen, he ________ in the garden. 

A. sing; sing                                             B. sings; sings

C. is singing; sings                                    D. sings; is singing