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用所给单词的适当形式填空 1. There are _______ (million) of birds in the

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用所给单词的适当形式填空
1. There are _______ (million) of birds in the forest.
2. You _______ (fail) the exam unless you work hard.
3. The cake _______ (make) by my mother yesterday.
4. The abacus was invented in the _______ (six) century.
5. I _______ (know) nothing about it until you told me.
用所给单词的适当形式填空 1. There are _______ (million) of birds in the
1. millions  
2. will fail  
3. was made
4. sixth  
5. knew