5сложноподчиненных предложений

1. She wrote a very good article after she had studied the problem thoroughly. 2. The train started after he had kissed her tenderly and wished good luck. 3. He rose to fame after he had written the novel “Pickwick Papers”. 4. (НЕПОНЯТНО!_The sun rose  The party  made for the top of the mountain. 5. She learned the poem by heart after She had listened to the record many times. 6. He had spent a few years in the Far East before he settled down in his native town. 7. He had been a widower for a year before he met Mrs. Jones. 8. She fell ill after they had moved to Siberia. 9. We had packed our things before the taxi arrived. 10. After the bell had rung the children ran out of the classroom.

Khan Academy is a non-profit educational organization. It has been created by Sal Khan. Khan Academy is available on the internet for free. Khan Academy teaches by using YouTube videos of short lectures of certain topics, as well as by using practice exercises and tools that help with learning. It is available in many different languages, but mostly English.

Khan Academy teaches mostly about mathematics, but also teaches biology, chemistry, physics, history, astronomy, cosmology, American civics, art history, economics, music, computer programming and computer science, healthcare, medicine, and finance. In the YouTube videos that Khan Academy makes, they record diagrams being drawn from a tablet using the screen capture software called Camtasia Studio.