一个两位数的个位是a，十位是2，用代数式表示这个两位数是[ ] A．2a B．a

用方框中所给单词的适当形式填空，使短文通顺、正确、连贯。

we, leave, rich, usually, when, enough, remember, with, something, baby

On a snowy evening, a rich lady was standing by the road. She was very worried. Her car had broken down. Just then a poor man, Robert, came. He was on his way back home from work as___1___.
The lady thought, “Is the man going to help me? He looks very cold and hungry.” But to her surprise, he stopped and said __2___ a smile, “What’s wrong, madam?” The lady told him what was happening.
After forty minutes, the car was at last fixed by Robert. The lady wanted to pay him. “No, that’s ___3___, madam.” he said, “I was just helping someone in need. If you really want to pay me back, I hope ___4___ you see someone in trouble, you can give him a hand.” A few minutes later, the lady saw a shabby (破旧的)house by the road. She ___5___ Robert’s words, so she stopped. The hostess(女主人) warmly asked her in. The lady could see that was not a ___6___ family and they needed help. When the hostess was making tea in the kitchen, the lady ___7___ 500 dollars on the table and went away quietly. Robert came home later than before, thinking how hard their life was. Their ___8___ was to be born the next month but there wasn’t ___9___ money. His wife went up to him, gave him a kiss and said softly, “Don’t worry, dear! Everything’s going to be all right. A stranger has helped us out.”
Let’s always be ready to help others because helping others is helping ___10____.