Почему Пётр 1 так заботился о деревьях?

IV. Запишите предложения и подчеркните в них модальный

глагол или его эквивалент. Переведите.

1 Our laboratory has to investigate a series of accidents that

have taken place in the locality within the last three months.

2 Every future miner should strictly follow safety patterns.

3 This company is able to expand production to 32 million tons

by 2020

4 Both surface and deep underground mining methods can be

used in this region.