Questions 17-20

Complete the following statements using NO MORE THAN THREE WORDS for each gap.

There is a __ at 13 Wardrock Place.

听力原文：Woman: The newly-developed product is called "self-heater gloves". The gloves themselves control the temperature inside automatically through the friction and rubbing of your hands against the inner side of the gloves. Since it is first introduced into market home and abroad, the sale is quite good. The marketing research shows that people are more concerned with special functions of products than before.

(19)

How many teachers come to school by bus？

What does the talk mainly concern？

听力原文：Woman: My job involves a lot of hardship, business trips, irregular life and that kind of thing. Last week I sold pure cotton and cotton wool to a business from Chicago. We bargain every item for a long time. It began from the inquiry about our products to final settlements. Fortunately, every deal was accomplished. The company and I both gained some returns.

(21)

What does business concern usually do？