At 13,Samuel received a training course in drawing for three years,________ he got a good opportunity for further development.
In our school it is a rule that the students are banned______computer games.
A great many students have dropped out of school and now the number of our class has____51.
The person____drugs had much difficulty in getting rid of the_____.
Years later, I began ______ what he told me right.
It’s no use ______ with him ______ this matter.