题目内容：

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 what  1. (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 are   3.  (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 sure    7.  wasn’t him.

Alan (opening fridge door): Well, it wasn’t me. But Mum, look! Are these your sandwiches here on the bottom shelf of  8.  fridge?

Mum: Are they there? Oh, my goodness. I   9.  have put them in there when the phone rang. Oh, dear. I really must be losing my  10.    Now, why did I