1.  He studied too badly to pass the exam.

2. It was so cold that we couldn’t bathe

3.  Would you be kind enough to answer this letter by return?

4. The story was too funny for us to stop laughing.

5. The floor wasn't strong enough for us to dance on. 

6.  There were too many exercises for me to finish in a short time.

7. He spoke so fast for us to understand 

8.  The restaurant is too expensive for us to eat in.

9. The house is too high for us to buy.

10. I am so unhappy that I cannot go out with him.

Hòa tan 50g muối ăn vào 450g nước . Tính nồng độ % dung dịch 

Help me !