at a loss

扫二维码，用手机阅读

I wonder what should I do ?
when the kids are so lovely
1 Q7 G7 j" R$ j+ Swhen the kids ask so much strange questions
; x4 n' E" a! f& [, E) t9 respecially when they take a exam
" {  Y( f+ }! g  ithe test is so easy,but the result is so bad !
: U2 o7 @) G$ r, T# oI feel at a loss ,when they know the keys,but they can't write the answer in words!