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A.The Thread.sleep（） method can take t1 as an argument.
B.The Object.notify（） method can take t1 as an argument.
C.The Thread.yield（） method can take t1 as an argument.
D.The Thread.setPriority（） method can take t1 as an argument.
E.The Object.notify（） method arbitrarily chooses which thread to notify.

A.move the line 12 print statement into the foo（） method
B.change line 7 to public synchronized void go（）{
C.change the variable declaration on line 2 to private volatile int x；
D.wrap the code inside the foo（） method with a synchronized（this） block
E.wrap the for loop code inside the go（） method with a synchronized block synchronized（this）{//for loop code here}