Define the type of each door and window.

Replace the words and word combinations in italics (A) by their contextual synonyms (B).

A.

1. The ultimate purpose of building techniques is to create a stable structure opposing to different forces.

2. Any building consists of some basic structural elements.

3. Enclosing units separate the building from the environment and give privacy to the adjacent rooms and spaces.

4. Windows are enclosing elements and serve for lighting and air circulation.

5. The bearing external and internal walls connected with floors form a stiff box which is able to resist horizontal forces, those of wind, for instance.

B. framework, isolate, construction methods, fundamental, oppose, ventilation, main task.

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