What are all those people looking at?

33 What are all those people looking at? ~                       
There (be) an accident. ~                                   
You (see) what (happen)? ~
Yes, a motor cycle (run) into a lorry.
34 I (phone) you twice yesterday and (get) no answer.
35 Originally horses used in bull fights (not wear) any protection, but
for some time now they (wear) special padding,            
    36 That house (be) empty for a year. But they just (take) down the 'For Sale' sign, so I suppose someone (buy)
it.