--Dad, I’ve got an "A" in the math exam. --Great. And I’m sure you will do better, because this is a good_______.
- Alan, can you tell me the answer _____the question? - OK!
- Time is money. - But I think time is _____money.
- Which month has_____ days in a year? -February.
The air in our city is getting much_____ now than a few years ago.
We have to stay at home_____ the bad weather.