Jim's plans to go to college _____ at the last moment
为了研究不同数学模式对学生代数成绩的影响，三位教师分别采用三种不同的模式执教三个班的代数课，这一研究中的自变量和因变量是()
“虚心涵泳”是朱熹的读书法，此处的“涵泳”是指读书时应()
What a pity! You missed the sightseeing, or we _________a good time together.
---I left my handbag on the train, but luckily someone gave it to a railway official.
---How unbelievable to get it back! I mean, someone ______ it.
