Teenagers are warned to be careful when making friends online, because when you can’t see a person, they could be __________.
He sat back on the chair, took a book and began to read, ___.
David apologized for ______ to inform me of the change in the plan.
They really have a great time too , designing everything , drawing the blue prints , the angles and so on .
—I really appreciate to holiday with you on this nice island .—It’s my pleasure .
—Henry doesn’t seem like the same person.— so much in the war has made him more thoughtful.