It's ______ ruler. It's ______ orange ruler.A.a;an B.an;a C.a;the
When the teacher comes, we all stop _______ and do our homework?
._______ to the zoo, take the bus No.5.
-- _______ shall we meet tomorrow? -- At the school gate.
There _______ less air pollution in the country .
–Hello, May I speak to Lucy? --_________.