When realizing they would be ___ of traffic jams orair pollution more people will choose public transportation

usend the best wishes to your wife on her birthday, _______will give her a greatsurprise．

The teachers insisted that the student ______wrong and that he _______

The Mekong River Commission has found no evidence______ the dams on the upper reaches have an influence on the water flowdownstream

Even though his friends like to ___ him,he never takes it seriously. [ ]