:choose the correct articles a/an american car a/an university a/an mp3 player a/an taxi a/an old man a/an maths exam a/an exercise a/an hour

An American car,a university,a MP3 player, a taxi,an old man,a math exam,an exercise,an hour.

An American car
A university
A MP3 player
A taxi
An old man
A math exam
An exercise
An hour

1.a
1.homework
2.theatre
3.novel
4.walk
5.museum
6.cinema
7.board
The Key word: Weekend
2.b At my weekend I usually do my homework in the morning . So , I can be free for the rest of the day . Also I usually read different novels. I like reading very much. In the afternoon I go for a walk with my friends. We usually have a good time together. Sometimes we visit our local museums or cinemas. In the evening my parents usually go to the theatre. I don't go to the theatre with them because I think it is boring.

1. Сhain surveying

2. Angles in surveying are measured with special instruments called transit

3.  Route survey is a survey necessary for the location and construction of transportation or communication lines such as highways railroads, canals, transmission lines and pipe-lines.

4. City surveying

5. Before construction begins the exact position of the various parts of the dam are fixed on the ground by using normal surveying methods. In choosing the site for a dam an engineer should study on a map the courses of all the rivers and streams in the area. By reading the contours he should calculate the amount of water which can be stored by building a dam of a given height in a certain place.

6. When deciding the route of a railway or road, the gradients, radii of curves, heights of embankments and depth of cutting can be calculated from data supplied by the surveyor

7. Terrestrial photogrammetry or photographic surveying from ground stations