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They are trying to develop a convincing theory to explain how the needles work in preventing pain, o...

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Keep on trying  If you keep on trying   Keeping on trying  To keep on trying  
lacking, in order to   lack, so that   lack, so as to   lacking, so that  
it    one    that    what  
raise  promote  rise  develop  
lacking;in order to  lack;so that  lack;so as to   lacking;so that  
lacking; in order to    lack; so that    lack; so as to    lacking; so that  
one   that   those   all  
must  should  would  may  
carry out   figure out   watch out   make out  
trying to find  trying to read  trying to buy  trying to borrow  
carry out    figure out    watch out    go out  
save    get    develop    attract  
Keep on trying    If you keep on trying    Keeping on trying    To keep on trying  
it    that    what    one  
that    what    it    one  
carry out    figure out    break out    watch out  
trying to find  trying to read  trying to buy  trying to borrow  
trying to find  trying to read  trying to buy  trying to borrow