Choose the most suitable answer

Choose the most suitable answer
1.___ moon revolves round ___ earth.
A.X,the B.A ,a C.A,the D.The ,the
2.There is ___ “N” in the word “English”.
A.a B.an C.the D.X
3.__ elephant is ___ useful animal.
A.the ,an B.An,a C.An ,an D.A ,an
4.To my surprise ,Brian has eaten up four __.
A.bowel of rice B.bowels of rices C.bowels of rice D.bowl of rices
5.__ are sitting at the breakfast table.
A.Turners B.The Turner C.Turner D.The Turners
6.It is about __ walk from the office to Central.
A.half an hour ’s B.a half hours’ C.half a hour’s D.half an hours’