已知,如图∠1=∠2,∠3=∠4,求证:BC∥EF.
证明:∵∠1=∠2
∴____∥____ (____)
∴____=∠5 (____)
又∵∠3=∠4
∴∠5=____ (____)
∴BC∥EF (____)
Which of the following underlined parts in different in pronunciation?