Put in that, which or who
1.the book_we are speaking about was written by Stephen King.

2.He sent me an answer_was very short.
3) The place _ we are speaking about is very famous.
4) The play was written by Bernard Shaw _ was a famous playwright.

Можешь на свой взгляд немного подкорректировать, не страшно)

today, many teenagers use gadgets. Gadgets help in our life, make it easier. Teenagers use gadgets for more than just entertainment. Training can also be combined with gadgets. In today's situation, gadgets are needed for online lessons. The communication between the teacher and the students takes place through smartphones and a computer. Of course, there are games in gadgets too. Unfortunately, many are addicted to their smartphones. Teenagers devote little time to reading, live communication with relatives and friends. Social media takes up enough time that you don't even have time to sleep. But there is nowhere in our world without gadgets. Thanks to them, humanity has stepped to a new level.

1. The name ANNA is the same when you read it backwards and forwards.

- Имя АННА пишется одинаково как бы вы его не писали, будь то обратный порядок или обычный.

2. The wheels on a bike go round and round.

- Колёса на велосипеде крутятся по кругу.

3. We use the stairs to go up and down.

- Мы используем лестницу, чтобы подняться или спуститься.

4. The door is open so people can come in and out.

- Дверь открыта так что люди могут заходить в выходить.

5. Look left and right to see if there are cars on the road.

- Смотрите налево и направо, чтобы проверить наличие машин на дороге.