—John has put forward ________ most challenging question for us to answer.—Yes,it really is.I have never heard ________ harder one.
. The doctor suggested that I should have a balanced diet ____ just protective food.
. _____________ is a fact that English is accepted as an international language.
. ______is mentioned above, the number of the students in senior schools is increasing.
. . Our neighbor has ____ ours.
. To our pleasure, his parents came to accept the fact ____.