几道英语单项选择题，望大家热心帮助

1.They have many pets,＿＿two black cats.
A.include B.to include C.including D.included
2.I like the animals in the zoo because they're so＿＿.
A.alive B.lovely C.living D.lively
3.She hopes to have many songs＿＿.
A.listen B.to listen C.listen to D.to listen to
4.They have to＿＿for about four years.
A.go away B.be away C.leave D.come
能说出为什么吗？

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