请把下面方框中的句子填入空格内,使对话完整、正确。 A. P-E-N, pen. B. How are you? C. Good afternoon, Cindy. D. It's red. E. What's this in English? Helen: __ 1 __ Cindy: Hi, Helen. __ 2 __ Helen: I'm fine, thanks. How are you? Cindy: I'm OK. Cindy, __ 3 __ Helen: It's a pen. Cindy: Spell it please. Helen: __ 4 __ What color is it? Cindy: __ 5 __