She devoted herselfto her research and it earned her a good reputation in her field .
I often think of the years ____ I worked with the foreigners, ____ has had a great effect on my later life.
He expressed his hope ____ he would visit China again the next year, and this was the very hope ____ he expressed as soon as he arrived in the country.
____ has finished the task ahead of time will be rewarded, though we don’t know who it will be.
The changes in our chemistry lab will cost quite a lot, ____ they will save us money in the long run.
Living things are dying out quickly. Let’s ask ____ destroying them in the past years.