Which sentence/question is correct? a) Alexander Fleming discovered penicillin in1928.D) Alexander Fleming just discovered penicillin.6.a) Have you ever seen a rattlesnake?b) Have you seen a rattlesnake yesterday?a) Did he ride his bike two hours ago?b) Did he ride his bike yet?7)a) They have never written a text message.b) They have not written a text message in theJast lesson.a) We have cleaned the car last Thursday.b We have just cleaned the car.8)a) They just went to town.b) They went to town yesterday.a) My grandmother has already got up.b) My grandmother got up an hour ago.9)a) We already bought this car.b) We bought this car in 2003.5)a) I have not visited my uncle two weeks ago.b) I have not visited my uncle yet.10)a) Anke ever moved to England.b) Anke moved to England in August 2006.​