补全对话 A:Hi,my name is Alan.1.（ ）？ B.My name is David. A.2.（ ）

补全对话 A:Hi,my name is Alan.1.（ ）？ B.My name is David. A.2.（ ）. B.Nice to meet you,too. A.3.（ ）. B.Oh,it's a watch. A.Oh,David！4.（ ）？It’s beautiful. B.Yes.It's my watch.Thank you. A.5.（ ）.