13.4 Put the verb into the most suitable form,present perfect or past simple.
1.A:Look!Somebody has spilt(spill)coffee on the carpet.
B:Well,it wasn't (not/be)me.I didn't do (not/do) it.
2.A:Ben ...(break) his leg.
B:Really?How ...(that/happen)?
A:He ...(fall) off a ladder.
3.A:Your hair looks nice. ..(you/have) a haircut?
B:Yes.
A:Who ...(cut) it? ..(you/go) to the hairdresser?
B:No,a friend of mine ...(do) it for me.