Would it be ______ for you to pick me up at four o’clock and take me to the airport?

_____ time, animals have developed many ways to stay away from their enemies.[ ]

Do you have _________ e-mail address —Sorry, I don’t have one.

Where on earth have they gone? — I have no idea, but I wish I _____ . [ ]

around the university, we then were taken to abuilding, ______ many scientists worked.