84．Bob likes elephants because they look very strong．(对划线部分提问)

　 _________________________________Bob like elephants?

83．Sarah is watching TV．(改为否定句)

　 Sarah _____________________　 _____________________TV．

82．Is there a supermarket in front of the hotel?(作肯定回答)

　 __________________，there__________________________.

　 按括号内的要求改写下列句子。

81．Tom speaks English．(改为一般疑问句)

_________________Tom__________________English?

80．Thank you for_________________a beautiful song(歌曲)for US.

79．Please_______________________quiet when you are in the library.

78．一Hi，Mary．Let’s______________a walk on Center Avenue after supper,

　 　-That sounds great.

77．一What’s your grandfather doing?

一He________________newspaper．

76．The girl is from Japan，and she________________in Tokyo．

75．-Where's Steve?

　 　-He's swimming in the p________________.

C)用方框内所给动词的适当形式填空，必要时可加助动词。