When I went in, they were ____ in a heated discussion.
The boy wanted to ride his bicycle in the street, but his mother told him _______.
We agreed _______ here but so far she hasn’t turned up yet.
—You were brave enough to raise objection at the meeting. —Well, now I regret _______ that.
The first textbooks _______ for teaching English as a foreign language came out in the 16th century.
He sent me an e-mail, ________ to get further information.