2) Complete the conversation with the correct modal may, might, could or must

a) - Lily _______________ have eaten the cake
- How do you know Lily ate it?
- She was the only one at home this afternoon!

b) - Someone sent me flowers!
- How nice! Who sent them to you?
- I don’t know. There was not card…. But it ____________ have been my parents.

c) - It ___________ have rained last night.
- Why do you say that?
- All of the cars parked on the street are wet.

d) - Where did I catch this terrible cold?
- You _____________ have caught it from Diane. She was coughing on Monday.