阅读下面的短文，在空白处填入一个适当的词，或填入括号中所给词的适当形式。
Christmas was coming. Mr Smith had no money to buy any presents for his children. He was quite(worry) about it.
"We have only a cock," said Mrs Smith one day. "You'd betterit to the town.(sell) it there and buy some cakes and sweets for our children."
"It's a good!" the man said. He caught the cock the next morning andit into a box. It was difficult for him(walk) because thick snow was here and there on the road. Two hours' journey was really very(tired), so he wanted to have a rest. He put the box onto the ground and sat down.
"The air outside the box is(fresh) than that in the box," the man said to(him). "I'd better let the cock walk outside for a minute, or it'll die."
So he put the cock onto the ground. After a few minutes he wanted to start again, but couldn't catch it any longer.
"How foolish you are!" Mr Smith called out angrily. "At night you can tell break of day,why can't you find the way back to the box in the daytime?"