用括号内所给动词的正确形式填空49.Althoughshoppingonlineisfastandeasyyou’dbetter(notbe)crazyaboutit.50.Itissaidthatsomepeople(se

　　用括号内所给动词的正确形式填空

　　49.Althoughshoppingonlineisfastandeasyyou’dbetter (notbe)crazyaboutit.

　　50.Itissaidthatsomepeople (send)toMarsinafewyears.

　　51.Tomwasseen (jump)intotheriverandhelpthechildout.

　　52.—Everystudentinourclasswasatthemeetingexceptyou.Why?

　　—Sorrysir.MsWang (explain)amathsproblemtome.

　　53.Myfather (work)inafactoryforfiveyears.Butnowheisateacher