If we _________ the earth, we must take action before it is too late.
They were determined to carry out the plan at first, but then we ________ persuade them to change their minds.
In many countries in the world, breakfast is a snack _______ a meal, but the traditional English breakfast is a full meal.
---Have you finished the report?---Oh, sorry. It was so noisy in the office that I couldn't _______ down to write anything.
---Are you still thinking about yesterday's party? ---Oh, that's _______.
When I got home, the clock was _______ seven.