______ that the South African writer John Coetzee won the Nobel Prize in Literature for 2003

下列各句中，没有语病的一句是

Research _______ that over 90 percent ofhigh school students are dissatisfied with their test scores

_____different life today is ________what it was 30 years ago

Peter has good grades in all his subjects, buthe never shows off.–I agree. He is very _________.