______ the police thought he was the most likely one, since they had no exact proof about it, they could not arrest him.
As long as you stick to it,you’ll make progress ________.
The two balls fell ________the same speed and landed ________the ground at the same time.
After many years of hard work,Mary and her husband had at last paid ________all the money they had borrowed.
They thought the meeting was ________great importance.
________the birthrate down by 10%,the number of the population has decreased.