A．To enrich the forms of art．
B．To prevent people from being too sad．
C．To relax the audience during tense moments．
D．To give people a little surprise．

A．Tell them jokes．
B．Laugh with them．
C．Entertain them．
D．Make them relax．

A．Given by the local government．
B．Born by a large number of bitches．
C．Bought from different cities．
D．Captured over grassland．