1.They are having a heated a_____ about whether to go picnicking or not.
2.Just wait a minute.I'll be back in a f______.
3.She is s____ a nurse.How can you expect her to deal with suck a serious wound?
4.This road is r_____ .It is not smooth at all.
5.We hadn't f_____ the difficulty we would meet.
Some scientists have given an e_____ of why it is so cold in some places this year.