________ warm at night, I would fill the woodstove, then set my alarm clock for midnight so I could refill it.
The student couldn’t _________what the teacher was trying to explain.
It won’t be long before we _____________ a way to overcome the difficulties.
Whenthe future, many people will imagine a lifehigh-tech devices.
---Do you think he will do me a favor? ---As far as I know, he is the last one ___ others. He ___ be prepared to give you a hand, though.
As we all know, every minute _____ full use of ____ our lessons will do good to us students.