问题描述：
1.Itwasverylatetosavethedrowningboyashehadgonedownforthethirdtime.
2.Johnsaidhismotherwouldbuyhimafive-speedsracingbicycleforhissixteenthbirthday.
3.Ofthetwolectures,thefirstwasbyfarthebestone,partlybecausethepersonwhodeliveredithadsuchapleasantvoice.
4.Theoldartistisinthehabitofgoingforawalkintheparkeverymorningexceptitrains.
5.ThebookwassoboredthatIreturnedittothelibrarywithoutfinishingit.
6.Maradona,wholedArgentinatotheirWorldCuptriumphinMexicoinJune1986,isundoubtedlyoneofthegreatestsoccerplayertheworldhaseverproduced.
7.Thecitywherewe’revisitingreceivestwiceasmuchrainfallasoursdoes.
8.SomefruittreeswhichoncegrowonlyinChinacanbefoundeverywhereintheworldnow.
9.Theteacherwhohadknockeddownbyabuswasimmediatelysenttoanearbyhospitalbyseveralpassers-by.
10.Thedetectiveshavebychancefoundthephotoofamanwhotheybelievetobethesuspectofthecase,forwhomtheyhavebeenlookingfor.
烦请说明错误原因,并改正.
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