单项选择题
A.spends B.costs C.pays
David's younger brother is（）engineer.A.aB.anC.the
单项选择题David's younger brother is（）engineer.
A.a B.an C.the
My father is a programmer and he works in（）A.computerB....
单项选择题My father is a programmer and he works in（）
A.computer B.computers C.a computer
Kate and Mike always do（）homework together.A.hisB.herC....
单项选择题Kate and Mike always do（）homework together.
A.his B.her C.their
