Given the task definition and input, reply with output. In this task, you will be shown a passage. You need to write a fill-in-the-gap question based on your understanding of the events that might be inferred from the passage. Your question should be answerable based on the passage and only have one correct answer. Show the gap in your question with a _ .

Grandparents have pleaded for the safe return to Australia of two young children whose mother took them from Melbourne to the Islamic State capital in Syria. Former Melbourne woman Dullel Kassab fled to Raqqa in Syria with her children last year, and she regularly boasts on Twitter that her four-year-old daughter and two-year-old son sleep with toy guns next to their beds and her daughter likes watching IS videos of 'Muslims killing bad ppl.' The children's paternal grandparents say they are worried Kassab, 28, is 'brainwashing' the children, after their father was killed near the Syria-Turkey border last year, The Herald Sun reported.Grandparents have pleaded for the safe return of two children in SyriaFormer Melbourne woman Dullel Kassab fled to Raqqa in Syria with her four-year-old daughter and two-year-old son last yearShe said her daughter likes watching IS videos of 'Muslims killing bad ppl'

Kassab posts pictures to Twitter of airstrikes hitting blocks away from their _ apartment.