1 . The Japanese Macaca monkey has been studied in the wild for over 50 years. In 1952, on one small Japanese island, scientists dropped some ________ with dirt for the monkeys. The monkeys liked their taste, but they found the dirt ________.

One clever 18-month-old monkey found the way to ________ the problem by washing the sweet potatoes in a nearby river. She taught this to her mother. Her ________ also learned this new way and they taught their mothers too.

All the younger monkeys ________ learned to wash the dirty sweet potatoes to make them ________ to eat. But many older monkeys found it very hard to learn this and still ate the ________ sweet potatoes.

Then something very surprising________. In the autumn of 1958, scientists found that the monkeys on other nearby ________ began washing their sweet potatoes too. Scientists still don’t fully understand how this knowledge was________ from one island to another.

2 . It was sunny last Friday. I arrived at the railway station at three in the afternoon. I would take the _________to Shanghai to see my old friend Jack. But it was two hours _________my train left. I thought it was the perfect time and place to look _________an act of kindness to do.

Outside the station, there was a girl having_________for sale. I told her that I’d like to buy flowers for someone else, and that she could_________who she will give the flowers to. She looked a little puzzled(困惑的), _________I suggested that perhaps she could give the flowers to someone who looked a little_________. That was because the flowers might cheer him or her up.

“That’s a crazy idea!” said the girl. But then I explained a little more about the idea of doing something for a_________, and she understood.

“I’m leaving for Shanghai and then I’ll_________know how it turns out,” I said. “But you will have a good__________to make someone happy. __________good deeds(善举)we do, they always come back to us.” At that time, she started to seem excited about it.

She went to__________the flowers out of the water, and I explained, “You’d better leave the flowers there until the person__________.”

At that time, I thought she was__________surprised and happy, because it might be her first time to meet a customer like me. I__________for the flowers, said goodbye, and walked into the station.

How wonderful the day was!