To determine whether to use the Present Simple or Present Continuous tense for each verb in brackets, it's important to understand the context and the typical usage of each tense.
Where are you going? (go)
- This question is about current plans or arrangements, which is why the Present Continuous tense is used: "Where are you going?"
How do you usually get there? (get)
- This question refers to a habitual action or routine, which is why the Present Simple tense is appropriate: "How do you usually get there?"
What time does the plane leave? (leave)
- This question is about a scheduled event. Scheduled events, even in the future, are often expressed using the Present Simple tense: "What time does the plane leave?"
When do you arrive in Cairo? (arrive)
- Similar to the previous, this question is about a scheduled arrival, so the Present Simple tense is used: "When do you arrive in Cairo?"
Where are you staying when you get there? (stay)
- This question is about a temporary situation or arrangement during the holiday, so the Present Continuous tense is used: "Where are you staying when you get there?"
What do you want to do there? (want)
- This question is about a general desire or intention, so the Present Simple tense is appropriate: "What do you want to do there?"
Are you taking a camera with you? (take)
- This question is about the current plan or arrangement regarding bringing a camera, so the Present Continuous tense is used: "Are you taking a camera with you?"
In summary, the choice between Present Simple and Present Continuous depends on whether the action is habitual, scheduled, or a temporary/current arrangement.