1.When --- taken---(take) into a dark room,the boy burst int

1.When ___ taken___(take) into a dark room,the boy burst into tears. 为什么不能用 having been taken?
2.You must speak louder so taht you can make yourself __heard__(hear)
为什么不能用 to be heard?
3.I can't imagine how they could stand __leading__(lead).
为什么不能用to lead?
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