用方框中适当的词填空。 even if , until , so that , even though , although 1. Say it loudly_______ we can hear you clearly. 2. He didn't go to bed_______ he finished the work. 3. He went on with the work_______ he was very tired. 4. _______ he knew he would be punished by doing so, he kept doing. 5. _______it is midnight, the scientists are busy with the experiment.