Tactics puzzle 1 :-- Find the best move

As A training, Try to find the next best move when you see a diagram before scrolling down 

[Event "?"] [Site "?"] [Date "2013.05.31"] [Round "?"] [White "Tactics"] [Black "Double Attack 1"] [Result "*"] [SetUp "1"] [FEN "7k/p2q2pp/2pP1p2/2r1p3/P7/7P/3Q1PP1/3R2K1 w - - 0 1"] [PlyCount "1"] 1. Qb4 {[%cal Gb4c5,Gb4b8,Gb8h8]} ({Houdini 3 Pro x64: 1)} 1. Qb4 g6 2. Qb8+ Kg7 3. Qc7 Qf7 4. Qxf7+ Kxf7 5. d7 Rc1 6. d8=Q Rxd1+ 7. Qxd1 Ke7 8. Qf3 Kd6 9. Qxf6+ Kc5 10. Qxe5+ Kc4 11. Qe6+ Kb4 12. Qxc6 Kb3 13. Qb7+ Kxa4 14. Qxa7+ Kb4 15. Qxh7 g5 16. Qf5 g4 17. Qxg4+ Kb5 18. Qg6 Kc5 19. Qg5+ Kd6 {[%eval 1812,24]} ) ({Houdini 3 Pro x64: 2)} 1. Qe3 Rd5 2. Rxd5 g5 3. Rd1 Kg7 4. Qc5 Kf7 5. Rc1 a5 6. Qc4+ Kf8 7. Qxc6 Qxc6 8. Rxc6 Ke8 9. Rc7 h6 10. Kf1 h5 11. Ke2 Kd8 12. Ke3 f5 13. Rf7 g4 14. Rxf5 gxh3 15. gxh3 Kd7 16. Rxe5 Kxd6 17. Rxh5 Ke6 18. Rxa5 Kd7 19. h4 Ke6 20. h5 Kf6 21. h6 Kg6 22. Ra6+ {[%eval 1143,24]}) * [Event "?"] [Site "?"] [Date "2013.05.31"] [Round "?"] [White "Tactics "] [Black "Double Attack 2"] [Result "*"] [SetUp "1"] [FEN "r1b1r1k1/pp3p1p/5qpB/3p4/3b4/1Q4P1/PP3PBP/3R1RK1 w - - 0 1"] [PlyCount "1"] {Hint:- Look at the pieces that aren't protected} 1. Qa4 ({Houdini 3 Pro x64: 1)} 1. Qa4 {[%cal Ga4d4,Ga4e8]} Be6 2. Qxd4 Qxd4 3. Rxd4 Rad8 4. Re1 f6 5. Bxd5 {[%eval 478,25]}) ({Houdini 3 Pro x64: 2)} 1. Bxd5 Be6 2. Bxe6 Rxe6 3. Qxb7 Rd8 4. Be3 Bxe3 5. Rxd8+ Qxd8 6. fxe3 Re7 7. Qb3 Qd2 8. Rd1 Qxe3+ 9. Qxe3 Rxe3 10. Kf2 Re7 11. Kf3 Rc7 12. Rd2 Kg7 13. Kf2 Rc6 14. Ke3 a5 15. Kf3 Rf6+ 16. Ke3 Re6+ 17. Kf4 Rf6+ 18. Ke4 Re6+ 19. Kd5 Re3 20. Kd4 Re8 {[%eval 4,25]}) * [Event "?"] [Site "?"] [Date "2013.05.31"] [Round "?"] [White "Tactics "] [Black "Double Attack 3"] [Result "*"] [SetUp "1"] [FEN "2r3k1/p2q1ppp/1p1b4/2p2N2/8/2PP4/PP2Q1PP/R6K w - - 0 1"] [PlyCount "5"] 1. Qg4 ({Houdini 3 Pro x64: 1)} 1. Qg4 Qxf5 2. Qxf5 Rd8 3. Rf1 f6 4. Qd5+ Kf8 5. Qb7 b5 6. Qxb5 Re8 7. Qa6 Bb8 8. Qc6 Kf7 9. Qd5+ Kf8 10. Qxc5+ Kg8 11. d4 h6 12. Qh5 Kf8 13. Qd5 Re7 14. c4 Re8 15. Qb7 a5 16. c5 Bf4 17. c6 Re7 18. Qa8+ Kf7 19. Qxa5 Bc7 20. Qd5+ Kf8 21. b4 Re3 22. Qd7 {[%eval 1155,24]}) ({Houdini 3 Pro x64: 2)} 1. Nxd6 Qxd6 {[%eval -18,23]}) 1... Bf8 2. Nh6+ Kh8 3. Qxd7 *