补全对话 A：Hi! Good morning. B：Good morning. ? A：My name is Tom. Nice to meet you. B： . A：Excuse me. Do you have an English tape? B：An English tape? . A：Is it on your desk? B：No, it isn't. A： ? B：I think（认为）it's under my chair. A： . B：You're welcome（不用谢）.
