We had a picnic last term and it was a lot of fun,so let's have ________one this month.
—Were you worried about your daughter last night? —Yes. It was __________.
Mr. Li is __________ chairman of the meeting.
This school was the first __________ textbooks as well as reading materials.
You can never be __________ when crossing the street.
—He was nearly drowned once. —When was __________? —__________ was in 1998 when he was in middle school.