Exercise of Past Modals

Hello everybody! The post of today is an exercise of past modals, I hope you like it. This exercise have a time limit!! So good luck!

Modal verbs. PAST

Matching exercise

  

Match the items on the right to the items on the left.

I'm not sure if I passed the exam. I don't feel very sure that I passed. I......passed the exam.	Perfect! can't/couldn't have may/might not have must have might/could/may have been may/could/might have
Last summer I took four exams and failed them all! You......been very disappointed.	Perfect! can't/couldn't have may/might not have must have might/could/may have been may/could/might have
Their plane was delayed and they had to wait 36 hours in the airport. They......been very happy with the airline.	Perfect! can't/couldn't have may/might not have must have might/could/may have been may/could/might have
I saw John yesterday - he looked very pleased with himself. He didn't say why but I think he got that job he applied for. He......got that job he applied for.	Perfect! can't/couldn't have may/might not have must have might/could/may have been may/could/might have
We agreed to meet yesterday, but when I got there I didn't see him. It's possible he was waiting elsewhere. We agreed to meet yesterday but when I got there I didn't see him. He.....waiting elsewhere.	Perfect! can't/couldn't have may/might not have must have might/could/may have been may/could/might have