1 at 2 in 3 at 4 at 5 on 6 in 7 by 8 at 9 at 10 at in at 11 in 12 at 13 at 14 in 15 in
В зависимости от контекста.
Либо «возьми мою лошадь», либо «поскачу на лошади».
His car is too fast, it can be dangerous
He finished this new book so fast, he probably liked it a lot
I know this question I will finish it very fast
I have to go home very fast my parents are waiting
Fast way is not always the best one