They often stay up, reviewing their lessons, books all over the desk.
The person we talked about ____ our school last week.
Before he went abroad,he spent as much time as he _____ English.
______ is it _____ has made Peter _____ he is today?
It would be a good idea to use a plastic bottle, ___cut off, as a container to grow young plants in.
They ______ on the program for almost one week before I joined them, and now we _____on it as no good results have come out so far.