Вставьте предлоги или наречия: 1)Every tooth consists … a crown and one or more roots. 2)It is insensitive … pain. 3)Any damage caused … decay or injury is permanent. 4)They are cemented together … the interprismatic substance. 5)The prisms run roughly … right angles … the surface. 6)Cementum is similar … structure to bone. 7)Dentine occupies the interior … the crown and root. 8)Vessels and nerves of the pulp pass … the root canal … the crown. 9)The outermost layer of the pulp is lined … special cells. 10.) They run … the full thickness of dentine. 11)Atooth is inserted … the jaw … its root. 12)Any tooth is attached … its socket … the jaw … a soft fibrous tissue called the periodontal membrane.

Jellyfish - the animals, which are all associated with something shapeless and extremely primitive, but their way of life and physiology is not as simple as it seems at first glance. The word "Medusa" usually implies animal from the class Scyphoid and representatives of the detachment Trailed of class Hydroid type Coelenterates. At the same time, in the scientific environment, this word has a wider interpretation zoologists indicate this term any mobile form coelenterates animals. Thus jellyfish are in close relationship with movable types coelenterates (siphonophorae, sea ships) and seat - corals, undigested, HYDR. In total there are more than 200 species of jellyfish.

Everybody has a hobby. 

I've got a friend who has a hobby too. 

My friend is fond of travelling.

He/she likes to visit ancient towns and cities, to meet new people.

My friend takes a camera with him/her and takes pictures of everything that interests him/her.

Travelling is the best way to study geography.

It is the best way to get to know and understand the people of different places and countries.

My friend tries to know the traditions and customs of the places he/she visits.  

My friend usually travels with his/her parents.

They go travelling by car, train and sometimes even by plane. 

So, to my mind this hobby is very important and useful nowadays.

We must communicate with people of different places.