1 b 2 c 3 b 4 a 5 c 6 c 7 b 8 a 9 c 10 a
1 If Jack hadn't failed his exams, he would have gone to the university. (Если бы Джек не провалил экзамен, он бы пошел в университет)
или If Jack had gone to the university, he wouldn't have failed his exam. (Если бы Джек пошел в университет, он бы не провалил экзамен)
Я не знаю, что составители теста имели в виду, так что пишу вам два варианта на выбор.
2 If we had had a map, we wouldn't have got lost.
3 If Nick hadn't been tired, he wouldn't have felt asleep in front of the TV.
4 If Ihadn't won the lottery, I wouldn't have bought a new car.
5 If I hadn't eaten many chocolates, I wouldn't have felt sick.