_____computer is a useful machine.加冠词?

_____computer is a useful machine.加冠词? 请帮忙作这套英语试题1三、 单项选择.( )1.---Is this ____ computer?---Yes._____ is _____computer.A.his; It; me B.your; This; his C.you; It; his D.your; It; my( )2.---How do you spell “ring”?---___________.A.R-I-N-G B.A ring C.It’s Who is the man in a u There is an A,an U and______R 英语：用at that time改写句子The boy is playing computer games now.The boy _____ _____computer games at that time. there is a person who love u is talking with u Is this a lie or u are telling a It is important for u什么a good breakfast my mother has a brother ,he is my u------- how much is a rear-view mirror in U.S there is a u in the world ruler. There is a U and anS in () use. U said,Beauty without virtue is a rose without fragrance. Miss Smith is an English teacher at a u U.S. President Barack Obama is a sucker.是什么意思? U told me.U gonna introduce me a good girl.Where is she The No.u have dailed is out of service,Ple dail later A u busy no LOVIN‘U,IS,NOT,A,DREAM,LOVIN’U,IS,LIKE,A,DREAM,这些英文浩解释啊