考查
恩格斯说:“鹰比人看得远得多，但是人的眼睛识别的东西远胜于鹰。狗比人具有敏锐得多的嗅觉，但是它连被人当做各种物的特定标志的不同气味的百分之一也辨别不出来。”人的感官的识别能力高于动物，除了人脑及感官发育得更加完善之外，还因为（ ）。
恩格斯说:“鹰比人看得远得多，但是人的眼睛识别的东西远胜于鹰。狗比人具有敏锐得多的嗅觉，但是它连被人当做各种物的特定标志的不同气味的百分之一也辨别不出来。”人的感官的识别能力高于动物，除了人脑及感官发育得更加完善之外，还因为（ ）。
Since this road is wet and slippery this morning, it _____ last night.
Since this road is wet and slippery this morning, it \_\_\_\__ last night.
Lily _____ have known the truth, or she would have told us.
Lily \_\_\_\__ have known the truth, or she would have told us.
Every day _____ water is wasted here though we are badly short of it.
Every day \_\_\_\__ water is wasted here though we are badly short of it.
_____ today, he would get there by Friday.
\_\_\_\__ today, he would get there by Friday.
According to the timetable, the train for Beijing _____ at 9:10 p.m. from Monday to Friday.
According to the timetable, the train for Beijing \_\_\_\__ at 9:10 p.m. from Monday to Friday.