Ответ:

Dear Rick,

I'm writing to you from my hotel in Switzerland. I'm having a lovely time here but you can't imagine what 1) happened (happen) to me yesterday. I 2) was (be) on the mountain with my friends and we 3) were having (have) a lovely time because the snow 4) was (be) perfect for skiing. Unfortunately the sun 5) was shining (shine) on the snow, so it 6) was (be) difficult to see. Suddenly, I 7) fell (fall) over. Luckily 8) I just hit (hit) a rock and I 9) got (not/be) seriously hurt - I just 10) got (get) a few bruises. Now I'm trying to be more careful! I'll see you when I get back.

Best wishes,

Kevin