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.

根据《合伙企业法》的规定，合伙人对合伙企业的债务应当承担（）

A.有限按份责任

B.有限连带责任

C.无限按份责任

D.无限连带责任