Though it is 30 years ____ we last met, I still remember the scene _____ we got separated on a rainy day.
Mr. Smith suggested the problem worth paying attention ______ at the meeting.
Don’t hesitate ______me if you have any questions.
—The English exam is not difficult, is it? —______. Even Tom ______ to the top students failed in it.
----Go for a picnic this weekend, OK? ---- ______. I love getting close to nature.
The villagers, _________ had been damaged by the flood, were given help by the Red Cross.