Complete the sentences with present perfect ot present perfect continuous 1. his dad (try) to repair the car for two hours 2. you (read) this article? 3. she (write) her essay for three hours

 Natural oily flammable liquid consisting mainly of a complex mixture of hydrocarbons of various molecular weights and some other chemical compounds. The color of the oil is usually solid black. Has a specific smell.Oil is found together with gaseous hydrocarbons at depths of tens of meters to 5-6 km. the Density of oil, like other hydrocarbons, is strongly dependent on temperature and pressure. It contains a large number of different organic substances and therefore is characterized not by boiling, and an initial boiling point of liquids.

 Natural oily flammable liquid consisting mainly of a complex mixture of hydrocarbons of various molecular weights and some other chemical compounds. The color of the oil is usually solid black. Has a specific smell.Oil is found together with gaseous hydrocarbons at depths of tens of meters to 5-6 km. the Density of oil, like other hydrocarbons, is strongly dependent on temperature and pressure. It contains a large number of different organic substances and therefore is characterized not by boiling, and an initial boiling point of liquids.