单项选择题
A.engaged to B.engaged for C.engaged on D.engaged in
The population of the earth（）increasing fast. One third...
单项选择题The population of the earth（）increasing fast. One third of the population here（）workers.
A.is;are B.is;hasbeen C.are;is D.is;was
He, as well as I,（）a student.A.beB.amC.areD.is
单项选择题He, as well as I,（）a student.
A.be B.am C.are D.is
She comes from（）people's Republic of China.A.oneB.aC.–（...
单项选择题She comes from（）people's Republic of China.
A.one B.a C.–（不填） D.the
