小马虎在计算一道加法题时，把十位上的“5”看成了“3”，结果是784．正确的答案应是______．
2个十是20，
784+20=804；
故答案为：804．
找出下列句子中错误的一项，将其序号填入前面括号里。
( ) 1. Then I went to a park in bike.
A B C D
( ) 2. we flew me kites.
( ) 3. It was a wind day.
( ) 4. Suddenly my kite flew under the lake.
