题目内容：

阅读下面材料,在空白处填入适当的内容(不多余三个单词)或括号内单词的正确形式.

Mum(putting on her coat) : I’m going to have to go down to the shop for more bread.

Alan: Why?

Mum: I’m not sure what1.(happen). I made some sandwiches earlier and left them on the table 2.I went to answer the phone. But someone must have taken them because they are3.(go).

Alan: Oh, it must have been Dad. I’m sure he was in the kitchen 4.(early).

Mum: No, he went off to his tennis match before I finished 5. (make) them, so he couldn’t have done it.6., he couldn’t carry a plate of sandwiches as well as all his tennis stuff, so I’m sure7.wasn’t him.

Alan(opening fridge door): Well, it wasn’t me. But Mum, look! Are these your sandwiches here on the bottom shelf of8. fridge?

Mum: Are they there? Oh, my goodness. I9.have put them in there when the phone rang. Oh, dear. I really must be losing my10. . Now, why did I put on my coat?