ГДЗ зошит граматика Англійська мова 8 клас Хейдерман Prepare

6. Correct the mistake in each underlined sentence.

Hi Pete,
I hope you’re doing well! I’ve just tried a new app for learning English, and I want to tell you about it. The app is not free of charge, (1) but it is run for free for a week if (2) a couple of advertisements are watched by the user. (3) The app is designed really professionally. (4) All the grammar is explained in such a simple way that it is easy to understand. (5) Other common languages, like German and French, are also included, so it may be useful for your German classes. (6) If any of your friends are registering on the app, your progress can be compared. I think it’s fun to learn together! (7) The app is given great reviews, and I can see why. But you have to make sure (8) you’re connected to wi–fi because (9) a lot of data is used. I definitely recommend giving it a try! Let me know if you do.
Talk soon, Mike