He started to learn English in 1990 and in the years ________ he kept on using it in his work.
Your opinion about the modern education is not similar to ____ of the other teachers’.
______ label to each of the trees, with detailed introduction of their features, and visitors will know more about them and how to protect them.
--Who is to give us the lecture today? ---The lady _____ our headmaster into the hall.
We are working to raise money for the local homeless shelters. _______ , we are collecting clothing to offer those in need.
The __________ conclusion is not a set one. It still needs further testing.