Had smallpox vaccination not been discovered - ...many children would still be dying of the disease, If intelligen beings existed on other planets - ...then they would have managed to contact us by now, Unless this device can be patented - ...it will probably be copied by many rival companies., If planes were to fly at a different altitude - ...they could reduce their contribution to global warming, If you should happen to pass the computer store - ...buy me anothe memory stick, will you?, Supposing you too your product to the exhibition - ...do you think many people would be interested?, Were thy to install a robot doctor on the spacecraft - ...the austronauts could monitor their health daily., If you'll wait here, - ...I'll go fecth the doctor,

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