______ almost all our time to our schoolwork in the past three months, we have almost no time for fun and play.
At the conference, they came up with three different _____ to solving the serious problem.
The music brought the days back to me _____ I was out of work wandering hopelessly on the streets.
Jack is the right person you can rely on to ____ the research when you are on vacation for the next two weeks.
He failed the final examination and only then ____ how much time he had wasted.
Recently, however, scientists have been finding that long-term use of these fertilizers can cause damage to the land, thus _____it less fertile.