We all feel it is Jack as well as his wife that ____ for their son's bad behaviour at school. [ ]

A. are to blame

B. is to be blamed

C. are to be blamed

D. is to blame

下列( )建设工程，必须实行监理。

A．大型公用事业工程

B．城镇居民自建住房

C．利用外国政府援助资金的工程

D．农村村民自建住宅

E．成片开发建设的住宅小区工程