The text boxes in the left panel have been placed in a random order. Restore the original order by dragging the text boxes from the left panel to the right panel.
左栏的文本框排列顺序是乱的。请把它们拖到右栏，恢复成原文的正确顺序。
Source
1The clot in blood vessels will block blood flow.
2Without the normal blood flow, it will cause muscle contraction.
3When the clot is formed, it will stay in the blood vessels.
4Heart attack is the caused by the sudden blockage of a coronary artery by a blood clot.
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