题目内容：

用所给词的适当形式填空。

1.__________(luck), I fell down from my bike and hurt my left leg．

2.When we have trouble, our teachers always give us a lot of useful __________(advise)．

3.He is an __________(active) boy so he seldom takes part in activities．

4.The Greens ____________(plan) where to go at this time yesterday．

5.I ______________(think) about the question already．