The American inventor W.H. Carrier developed the first air-conditioning unit in 1902. Since then, the (1)popularity of air-conditioners has increased (2)rapidly. Given people's (3)ability to function in the heat, air-conditioners provide them with a feeling of comfort. That is why the (4)likeliness of even more people installing air-conditioners for (5)personal use in the (6)privacy of their own home will increase further. But what do they do? Their aim is to (7)stabilise the temperature in a room. This is accomplished by the (8)presence of a fan, which also removes dust and odours from the air and controls the humidity. The (9)efficiency of air-conditioner depends on the power of its fan. Nowadays there is a great (10)variety of air-conditioners on the market which are bound to cover each person's needs
1. What were you doing at 9 o’clock? 2) Where did Ann go yesterday? She went to the library to borrow some books. 3) What’s your phone number? 4) Please don’t speak Italian. This is an English class. 5) He usually has breakfast at 8 o’clock. 6) How do they know English? 7) She is coming back on Wednesday evening. 8) Do you often talk in class? 9) How many students go to college every year? 10) I woke up early the day before yesterday. 11) Let me help you. 12) We are going to do it at the week-end. 13) Who answers guestions now?
