根据图片提示完成各个对话。( 10分) (1) —What is the ________ doing? —It's ________. (2) —Is the frog ________? —Yes, it ________. (3) —What ________ the monkeys doing? —They are ________. (4) —________ the koala bears ________ trees? —Yes, they can. (5) —Is Zip ________ an email? —________, it is.