at a loss

扫二维码，用手机阅读

I wonder what should I do ?
5 g) A* P$ P7 Z4 Y; I. G+ R- lwhen the kids are so lovely
when the kids ask so much strange questions
especially when they take a exam
( H8 X0 U# u% Q- X8 \7 gthe test is so easy,but the result is so bad !
I feel at a loss ,when they know the keys,but they can't write the answer in words!
4 X: {# G# L0 \6 h% h# i& z7 }