1.---Do you smoke?

1.---Do you smoke?
---No,doctors always say that smoking __A__ our health.(be harmful to )
A.is harmful to B.is harmful for C.is harm to D.is harmless to
2.He found the book shop _B_ of the street.
A.in the end B.at the end C.by the end D.on the end
3.---Can you hear her _C__ in the next room?(hear+宾语+宾语补足语)
---Yes.It sounds perfect.
A.sings B.to sing C.singing D.is singing
4.---May I smoke here?
---I am sorry but we do not ____ people ____ any where in the building.A(allow sb to do sth)
A.allow;to somke B.allow;smoke C.let; to smoke D.make;smoke