7 . 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
Does Takeaway Exist in Ancient China?
As early as in the Song Dynasty, “takeout” services were already available. In Zhang Zcduan's popular painting Riverside Scene at Qingming Festival, there is a restaurant boy who has just come out of the shop with “to-go boxes” in his left hand and tableware （餐具） in his right, still 1 (wear) the shop apron and seeming to deliver the food somewhere. That image 2 (believe) to be a reflection of the original takeaway boy.
In ancient times, there were three ways to order food. The first is servant order. Send a family retainer （仆人） to go to a restaurant and make 3 order. When the food is ready, there is someone who 4 (particular) delivers the food to the customer's home, and then gets paid. The second is agreed delivery. Sign a long-term 5 (agree) with the restaurant. The store, 6 every agreed day, will pack the food well and send it to the customer's home. The last one is door-to-door selling. The sellers from restaurants sell the food door to door, especially in the entertainment places like theatres, 7 are crowded with many people.
The to-go box, wenpan (warm tray), 8 (consist) of two layers of porcelain. When 9 (use), hot water is injected into the interlayer of the plate 10 (keep) the dishes warm. In this way, the dish is still warm when it arrives at the customer's home.
