根据对话内容，用适当的词语或句子补全对话。
A: How dirty your clothes are! What did you do today?
B: __1 ．
A: Oh, I have remembered．It's Tree Planting Day today． 2 ?
B: At the foot of the hill．The one on the other side of the river．
A: 3 ?
B: On foot．It's not 4 our school, you know．
A: But what made your clothes so dirty?
B: I fell into the river when I was carrying some water．
A: Bad luck! Be 5 next time．
B: Thanks a lot．I'll do．
1．We planted trees
2．Where did you work/plant trees
3．How did you get there
4．far from
5．careful