There isn’t enough _________ for us in the lift. Let’s wait for the next one.
—Did you see him yesterday?—No, when I got to the airport, he a taxi for home.
The old scientist devoted most of his time ___________ the space science.
_________good advice! It’s so helpful to us.
—Mary was heard_______ just now. What happened?—John was telling a joke.
Even if we are very busy, we should spend ______ doing exercise every day.