根据句意及括号内所给单词的提示填空。
【小题1】A funny thing ________(happen) in the office yesterday.
【小题2】These kids had an enjoyable and ________(education) day.
【小题3】Just now Jim and I had a ________(discuss) about how to make model planes.
【小题4】I didn't expect him ________(stay) so long.