at a loss

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I wonder what should I do ?
when the kids are so lovely
when the kids ask so much strange questions
1 n. i5 o7 w3 Q% yespecially when they take a exam
1 A2 L$ B7 i, T0 X" ?$ tthe test is so easy,but the result is so bad !
1 c, ?$ u, b- b2 `9 x& lI feel at a loss ,when they know the keys,but they can't write the answer in words!