6、_adoctornow,ifIhadstudiedmedicalscienceinmyyouth.A.wereB.shouldbeC.hadbeenD.shouldhavebeen13.Iknockedatthedoorseveraltimes__________anelderlyladycametoanswerit.A.beforeB.afterC.unlessD.then14.Heseemedveryyoung,but__________hewasolderthanallofus.A.innatureB.inrealityC.bynatureD.inorigin15. You ma
7、y not have played very well today, but at least you’ve got through to the next round and __________.A. tomorrow never comesB. tomorrow is another dayC. never put off till tomorrowD. there is no tomorrow16.Ithasbeensaidthatin