----- Mary looks very upset. She _______ failed to pass the exam. ----- I guess so. It's very difficult after all. A must have B could have C should have D might have
"Please __________why you're so late," said his girlfriend.
I'm sorry. I _____________ you__________ to me.
--Hi, Tracy, you look tired. --I am tired. I__________ the living-room all day.
You should take the medicine after you read the __________.
Tom suggested that we __________such a meeting, but Jenny insisted that it _________of great importance.