认真读下面故事，选出最佳选项。
We are friends
Billy was a little bird. He __________ in the forest. In the forest, there were many birds, too. But Billy __________ work or play with them.
“Winter is coming. But I don’t have a warm house. I must __________ a new one. I am not going to build a big one. I’m going to build a __________ and warm one,” he said to himself. “But __________ the other birds help me? 1 don’t think they will, because they don’t like me. And they __________ games happily over there.” Feeling sad, Billy started to build his new home alone(独自).
Suddenly, a lot of birds came up to him. “We have all come to help you, Billy,” they said. Billy __________ surprised and said, “I didn’t tell you I would build a house __________ did you know?” “We were not playing. We were working too. We saw that you were busy. We think that we can do something for you,” said one __________ the birds. Billy was moved (感动). “Thank you,” Billy said.
From then __________. Billy didn’t work or play alone. He had many friends. And he often helped them, too.
1．2．| A．didn’t | B． doesn’t | C．isn’t |
3．4．5．6．| A．was playing | B．play | C．are playing |
7．8．9．10． 
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