If it was not an accident, he must have done it .
You _______ pay too much attention to your reading skill, as it is so important.
“I promise that she _____ get a nice present on her birthday.” “Will it be a great surprise to her?”
“Mike is often absent from class.” “Tell him he _____ answer for it if he goes on behaving like that.”
It was not until he came back _____ he knew the police were looking for him.
It was ten o’clock _____ he came back home.