Double Repacement Reactions!?

From the following list of chemicals, select 2 combos that would lead to a double replacement reaction (complete balanced equations, too!)
KCl
HNO3
AgNO3
PbCl2
Na2SO4

Any ideas? Thanks

Answer:
Tell your teacher that a professional, practicing synthetic chemist told you nobody ever uses terms like "double displacement reaction" any more.
1. KCl + AgNO3 -----> AgCl + KNO3

2. 2HNO3 + PbCl2 -----> 2HCl + Pb(NO3)2

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