Ответ:

1. Are David and Sara going to visit Samat? — Yes, they are.

2. When are they going to go? — They're going to go there next month.

3. Is Samat going to show them places in Almaty? — No, he isn't. He's going to show them places in Astana.

4. Is Sara going to go shopping? — Yes, she is.

5. What is David going to do? — He's going to go up the Bayterek Tower.

6. Are they going to stay for a long time? — No, they aren't.