We began to open to the outside world in the late 1970s. ,there have been great changes in the country.
The president spoke at the business meeting for nearly an hour without ___ his notes.
He is really an excellent doctor and he is _____ to becoming an expert in this field.
He is such a strong-willed person that there is nothing in the world that can _____ him.
Come and see me whenever ____.
As we can see, the prices of vegetables _____ according to the season.