Каменный век делится на следующие периоды
Палеолит
​

Палеолит

Мезолит

Неолит

(энеолит) - переходный период к бронзовому веку

Каменный век делится на:

Палеолит - древний каменный век;

Мезолит – средний каменный век;

Неолит – новый каменный век.

1the fish was) caught by dan a fortnight ago. 2 the orchestra ( will be) conducted by a new conductor next month 3 good and bad feelings (are) usually expressed by all people. 4 three satellites (were) launched by russia last year 5 a new article (will be) included in this book next year. 6 'my family (is/was) always consulted by our family lawyer. 7 a lot of countries (will be) involved into this conflict tomorrow. 8 one million dollars (was) inherited by nelson two years ago 9 all the dishes (are) usually dried by our dishwasher 10 cats (are) usually chased by dogs 11. the text (was) listened to by the pupils at the previous lesson. 12. the shoes (will be) mended tomorrow by the shoemaker. 13 i (was) astonished by this two days ago. 14 mail (is) usually delivered by the postmen. 15 these mistakes (will be) noticed by the teacher tomorrow. 16. belts (were) fastened a minute ago. 17. meat (will be) chopped by the chef in ten minutes. 18. rules (are/were) usually explained by our grammar teacher. 19. all ingredients (were) mixed ten minutes ago.