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Can you gyus help me choose one of the bold parts and explain to me your choice?

1. The area is linked with more than 100 lost ships and planes and more than 1000 deaths.
Many of these must/might have been because of shipping accidents or tropical storms.
2. The plane was carrying the most modern technology so the radio operator back at
base must/might have thought it strange when he received a message
from the pilot complaining that they were lost.
3. Do you happen to know where they went/did they go?
4. I wonder why she said/did she say that.
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Your choices first pls.
Comments  
Marius Hancu Your choices first pls.

Okay, here are my choices but I bet they're wrong, are they not?
1. The area is linked with more than 100 lost ships and planes and more than 1000 deaths.
Many of these must have been because of shipping accidents or tropical storms.
2. The plane was carrying the most modern technology so the radio operator back at
base might have thought it strange when he received a message
from the pilot complaining that they were lost.
3. Do you happen to know where did they go?
4. I wonder why she said that.