73．A．We should water the flowers every four hours.

B．The flowers should 　　　　　　　 　　　　　　　　　　　 　　　every four hours.

72．A．He arrived with a policeman shortly before nine.

B．He arrived with a policeman shortly before 　　　　　　　　　　　　nine.

　 根据A句的内容完成B句，每空填一个词。

71．A．Mrs Morison can sing very well.

　　 B．Mrs Morison is very 　　　　　　 　　　　　　　　singing.

70．During World WarⅡGermany tried to beat Moscow in several months, but

　　 f　　　　　 .

69．Two thousand years ago people could travel very far by riding on h　　　　　 .

68．She had a serious car a　　　　　 　and broke her arm.

67．He likes his tea neither too hot nor too c　　　　　 　.

　 根据句子内容和所给首字母填入一个适当的词。

66．-What’s Lily doing, Lucy?　

-She’s reading a b　　　　　 　now, Mum.