按要求写句子 （每空一词）
(1)What’s this ?  (复数)   What ________  ________ ?
(2)What are these ?  (回答问题) ________  ________  hens.
(3)Are these tigers ?  (回答问题)
No, ________  ________ .  Yes, ________  ________
(4)The tiger cubs can jump through a ring. (否定句) 
The tiger cubs ________  ________ through a ring.
(5)Can ducklings swim ?  (两种肯定回答)  
Yes, ________  ________ . 或  ______________.