1. I told

2. How did the hikers get lost in desert? While they walked there, a dust storm started

3. Why didn't you use your mobile phone to call for help? It didn't have any battery.

4. We just reached the cave when it started to rain. We didn't come down from the mountain yet, so we got really wet.

5. How did you manage to light a fire so quickly? I tried for half an hour before I finnsly had success.

Ответ:

1B I'm not sure . I was talking to a neighbour at the time

2A How did the hikers get lost in the desert ?

2B While they were walking there, a dust storm started.

3A Why dont you use your mobile phone to call for help?

3B It hasn't any battery

4A we had just reached the cave when it started to rain.

4B you are so lucky ! We haven't came down from the mountain yet, so we are getting really wet.

5A How did you manage to light a fire so quickly?

5B Quickly ? I have tried for half an hour before I finally succeeded!