77．Mr. Brown had to sit down and rest every five minutes．(对划线部分提问)

_________ _________ did Mr. Brown have to sit down and rest?

按括号内要求，完成下列句子。每空格限填一词。

76．We have already finished our homework．(改为否定句)

we _________ finished our homework _________．

75．--I think math is less important than English．

--Oh，really? But I _________ with you．(agree)

74．You can _________ find the tower with the help of the guide book．(easy)

73．The _________ of the shop kept introducing the things to the travelers．(own)

72．You'd better take more exercise，because the less sport you do，the _________ you will be．

(lazy)

用括号中所给单词的适当形式填空，每空格限填一词。

71．We enjoyed _________ at the party，What about you? (we)