at a loss

扫二维码，用手机阅读

I wonder what should I do ?
- p! b8 J6 T) n- M7 c7 V5 J3 I  V) Mwhen the kids are so lovely
+ F& T8 o& o# b$ ~* T5 a3 t& u! J8 iwhen the kids ask so much strange questions
% Y" S  q& _2 R% Y: v! F: p0 H  yespecially when they take a exam
) f& J; C; Y8 w+ N7 K+ C8 m- r9 \$ Ythe test is so easy,but the result is so bad !
' {$ n2 C( J3 D& YI feel at a loss ,when they know the keys,but they can't write the answer in words!