题目内容：

根据句意和汉语提示写出单词，完成句子。

1._______ somebody sometimes does something good.(在某处)

2.The teacher knocked at the blackboard to catch our _______. (注意)

3.You should wash your hands before eating， to guard ______ disease (对抗)

4.With the ______of science and technology， our life is becoming more colourful. (发展)

5.I found a ______ dog on the street yesterday and now I'm trying to find its owner. (丢失的)