ГДЗ граматика Англійська мова 7 клас Мітчелл

There is an extra word in each of the sentences below. Cross it out. 

1. The Internet is an invention which it has made our lives easier. 2. People who they spend a lot of time on their phones complain about headaches. 3. That is the travel agency that it opened last month. 4. This is the science lab where the students do experiments there. 5. People destroy the forests where mountain gorillas live there. 6. That is the website which it has got information about travelling to Kyiv.