根据《行政处罚法》，违法行为在一定期限内未被发现，不再给予行政处罚。该期限为( )。
A．2年B．5年C．10年D．15年
参考答案：A
I ___________ in the street when I met an old friend of mine yesterday.
A．walked
B．was walking
C．has walked
D．had walked
I have _________ all my papers but I still can't find my notes. [ ]
A. looked through
B. looked for
C. looked after
D. looked out
