—Is the parking space ________ for all the cars in the community?—I’m afraid not, only about half.  

Would you be _______ to pick me up at four o'clock and take me to the airport?

Though most people are ____ the dangers of driving after drinking, many still insist on drinking alcohol.

When electric cars become ______ , we’ll need to build more charging stations.

It may not be a great suggestion.But before________is put forward，we’ll make do with it.