interrogative means question.
1.They prepare dinner. -> Are they preparing dinner?
2.Sally and Alan like broccoli. -> Do Sally and Alan like broccoli?
3.David drinks lemonade-> Does David drink lemonade?
This is already correct->4.Do Sally and Alan like tomatoes?
5.This is close but “drinks” should be changed to “drink” Does David drinks lemonade? -> Does David drink lemonade.