—I was born _______ May 10th.
A：on
B：in
C：at
D：of
已知f（α）= cos(π2−α)⋅cos(2π−α)sin(−π−α) ．
（I）化简f（α）；
（II）若角α为第三象限角，且f（α）=m，求tanα．
—Sorry , I'm not good ___it .
Would you drop in at my house this afternoon if _______?
