完成句子。 1. 他们最后终于脱离了危险。 They were out of danger _____. 2. 老师告诉我们茶叶是偶然发明的。 Our teacher told us that tea was invented _____ _____. 3. 根据他所说的,你是错了。 _____ _____ what he said, you are wrong. 4. 我昨天下午错拿了那把雨伞。 I took the umbrella _____ _____ yesterday afternoon. 5. 这样我们的学习效果就比较好了。 _____ _____ _____ we get better results in learning.