It's ______ ruler. It's ______ orange ruler.A.a;an B.an;a C.a;the
—Do you know sound travels very fast ? —Yes. But light travels sound.
Sandydoesn’t know how to make a home page. Let’s give her some .
—Would you please this picturethe wall? —Sure, my pleasure.
A big earthquake hit Ya’an the morning of April 20th,2013.
—Which do you think is , Chinese or English? —It’s hard to say. I think Chinese is as as English.