1.(I've started/I started school) when I was four
2.We can go outnow.Look! The rain (stoppped/has stopped)
3.An Englishman (invented/has invented) the World Wide Web in 1991
4.They aren't ready. They (didn't finish/haven't finished) their breakfast
5.Where's my bike? Someone (took/has taken)it!
6.What's the matter? (Have you lost/ Did you lose) something?
7.(I bought/I've bought) a tracksuit at the market last Saturday.
8.(I've done/I did) my homework. (I've done/ I did) it before dinner