Раскройте скобки 12. if they hadn’t walked 40 km, they (not / be) exhausted now. 13. what would have become of us, if i (come) to you then! ' 14. he would have been scrupulous — if he (can) ! 15. what is the answer if you (add) 17 to 75?

12. If they hadn’t walked 40 km, they wouldn't have been exhausted now.
13. What would have become of us, if I had come to you then!'
14. He would have been scrupulous — if he could have !
15. What is the answer if you add 17 to 75?