Lily ... be playing with Tony in the garden. Go and see.
COULD / MAY / MIGHT
John is very happy. He ... have passed the final exam with a high score.
MUST
Jack is traveling to Europe. I'm sure he ... be visiting Hanoi now.
CAN'T
Lulu hasn't eaten anything since yesterday. It .... be hungry now.
MUST
The lion is injured. It .... have had a fight with another lion, but I'm not sure.
MAY / MIGHT / COULD
That noise .... be a cat. It's a baby's cry.
CAN'T
The baby ... be sleeping. I've heard his voice.
CAN'T
Lucy took the quiz last week. She ... have been absent.
CAN'T / COULDN'T
He's wearing a white uniform. He ..... be a doctor.
MUST
Lana looks exhausted. She ... have worked hard.
MUST
The room looks so messy. I'm sure they ... have had a party last night.
MUST
Where's he from? - I don't know. He ... be from Italy.
COULD / MAY / MIGHT
I'm not sure what she's doing. She ... be doing her homework.
COULD / MIGHT / MAY