20．-Would you please give me a hand and take the bookcase upstairs?

　　 -　　　　　　　　　　　　 '．

A．My pleasure　　 　 B．With pleasure

C．Of course I do 　　　　　　　 D．Yes．That’s all fight

19. The tiger, once a __　　 __ animal to humans, is now ____ of disappearing on the earth.

A．dangerous, danger　　　 B．dangerous, in danger

C．in danger, in danger　　 D．danger, in danger