1) Could you explain what does it mean unification of the electromagnetic and
   weak interactions. What are the relations between couplings?
   New gauge symmetry which needed to be introduced?

2) Could you draw the cross-section for e+e- -> f+ f- process as a function of
   sqrt(s) in  the range from 0 to 200 GeV and illustrate are the contributions
   with the respective Feynman diagrams?

3) The LEP  experiments performed several outstanding high precision measurements
   in the domain of EW physics, like   Z-line shape  (mass and width of the Z boson)
   forward-backward asymmetry, number of neutrino families. 
   Could you say something more about one of those?  

4) What does it mean GIM mechanism and CKM matrix element?