Finish the second sentence so that it has a similar meaning to the first one, beginning with the given words or using suggestions

Finish the second sentence so that it has a similar meaning to the first one, beginning with the given words or using suggestions.
Question 1: I last saw her 2 years ago.
=> I haven’t …………………………………………………
Question 2: Phong was a faster walker than his brother.
=> Phong walked…………………………………………………
Question 3: The flight to London lasted four hours.
=> It took……………………………………………………………
Question 4: You can’t visit the UK unless you have a visa.
=> If……………………………………………………………………
Question 5: You are not allowed to leave the room without permission. (mustn’t)
=> ……………………………………………………………………
Question 6: The water is highly polluted. We cannot swim in this part of the river. (because)
=>……………………………………………………………………
Question 7: He’s more intelligent than other members in my group. (most)
=> ………………………………………………………………
Question 8: It is extremely dificult for them to cut down on smoking. (find)
=> ……………………………………………………………