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学生说明
Tap 
to move the words. Tap the screen or keyboard down button to start. Decide where the label goes and move the label to make a contraction or to show the words needed to make a contraction. Tap 
when finished.
教师备注（学生不可见）
Students could also use the 
and tell about the contractions he or she made.
Extension: Students could add their own words and contractions as well.
