Решение #
1. с
2. d
3. b
4. а
Как формировались условия:
0 Conditional: If + present simple + present simple
1st Conditional: If + present simple + will + bare infinitive
2nd Conditional: If + past simple + would/could/might + bare infinitive
3rd Conditional: If + past perfect + would/could/might have + past participle