Choose the word or phrase a) b) c) or d) that best complees the sentence or conversation:

1. A: Did you buy some new trainers?
    B: No, I ______. I found my old ones.
   a) hadn't b)should't c) mustn't d) didn't have to

2. I wanted to win but there was no way I ______ any faster in the race.
a) could have run b)must have run c) would have run d) should have won

3. If he'd trained harder he __________ the gold medal.
a) might have won b)should win c) must have run d) should have won

4. It's very unusual for her to arrive late. She _______ what time it starts.
a) should have forgotten b)must have forgotten c) should have forgotten d) can't have forgotten