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完成下列推理过程:

如图,已知∠A=∠EDF,∠C=∠F,求证:BC∥EF

证明:∵∠A=∠EDF(已知)

                  ▲                                    ▲                                    ▲                  

∴∠C=                  ▲                                    ▲                  

又∵∠C=∠F(已知)

                  ▲                  =∠F(等量代换)

                  ▲                                    ▲                                    ▲                  

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