Ответ:

1 My computer crashed , while I was downloading a song.

2 Tom lost his smartphone, when he was running in the park

3 The first International internet chat took place in February 1989

4 It was so hot yesterday. The temperature rised to 38 degrees Celsius

5 What were you doing this time last year?

6 I was waiting for the photos from Sandra last night, but she didn't send me any