1.Last night,I was watching T.V ... my mother was cooking in the kitchen.  A.then   B.and   C.when  D.while 2.Thank you very much ! ... ( That is right/Nothing/You are welcome/Don't mention ) 3.Do you ... my smoking in here ?  A.want   B.mind  C.worry  D.concern 4.Carrie is ... Mary. ( pretty than/prettier than/so pretty/more pretty than ) 5.We are looking forward to ... you in May. ( seeing/see/to see/be seen )