—Sir,could you please put out your cigarette?This is a smoke-free(无烟的)school.—________.
-Is this________ white ruler? -No. ________is yellow.
-________. What’s this in English? -________, I don’t know.
-are my keys? - They are under the bed.
My English is good. ________?
Here is my . My father, mother and I are in it.