阅读下面短文，用括号内所给动词的适当形式填空 (必要时可加情态动词或助动词)。
Mr. Brown was going away for a week. Before he left, he said to his son, "if anyone       (ask) for me, you can tell him that your father ______(be) out for doing something, and _____(come) back in a week, then be sure  _____(tell) him to sit down for _______(have) a cup of tea."　　"OK, Dad," said his son. But he was afraid his son couldn’t remember this, he _______( write) these words down on a piece of paper and gave it to him. His son put it into his small pocket, took it out and looked at it every now and then.
Four days passed, but no one came to see his father. The boy thought that there was no man to come and that the piece of paper was of no more use for him, so he burnt it that evening.
The next afternoon, someone knocked at the door. When the door ____ (open), a man  _____(stand)at the door ."Where is your father?" The man asked. The boy put his hand into his pocket at once and looked for the piece of paper. He _____(not, find )it. He suddenly remembered he had burnt it, so he shouted, "No more."
The man was very surprised. He asked, "No more? I met your father last week. Please tell me when  it_____（ happen ）?"　　"Burnt yesterday evening."