My translation from Russian into English № 2
1. Mary is in the gym now. She is playing table tennis now.
2. It`s hot, thirty above zero. Katty and Alan are eating a water-melon.
3. -Did you listen to the news? OR Have you listened to the news?
- Yes, I did?/ - Yes, I have. The president of Finland is coming today.
4. – Tom, I am inviting you to my party tonight.
- Thank you, but I am going to the concert.
5. What has happened?
- I am having a toothache. I am going to the dentist today.

Question

My translation from Russian into English № 2
1. Mary is in the gym now. She is playing table tennis now.
2. It`s hot, thirty above zero. Katty and Alan are eating a water-melon.
3. -Did you listen to the news? OR Have you listened to the news?
- Yes, I did?/ - Yes, I have. The president of Finland is coming today.
4. – Tom, I am inviting you to my party tonight.
- Thank you, but I am going to the concert. 
5. What has happened?
- I am having a toothache. I am going to the dentist today.

Answer

Without seeing the Russian, I can tell you number 5 would usually be said: "What happened?"
"I have a toothache. I am going to the dentist today."