at a loss

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I wonder what should I do ?
( ^2 L0 f! h8 n; Bwhen the kids are so lovely
) l9 `  f+ p0 E' kwhen the kids ask so much strange questions
/ v( r0 A5 q0 j4 M5 |& ~especially when they take a exam
4 }2 G' s+ A+ ethe test is so easy,but the result is so bad !
& k- o8 a: m$ N* [: VI feel at a loss ,when they know the keys,but they can't write the answer in words!