20.16.Mr.Chaplin can't be here because he'sC. A.gone to England B.ill C.gone to America 17.There is an importantBexam today. A.Math B.English C.Chinese 18.The exam ends atAo'clock this morning. A.11 B.9 C.7 19.If there is a difficult question,you shouldC. A.write it clearly B.a(chǎn)nswer it first C.go on to the next one and come back to it later. 20.Don't leave questions unanswered; sometimes aAmay help you get points. A.guess B.guest C.gate.