Everybody around him was smoking; _______ smoking.
Chọn đáp án C
_______ every industry in our modern world requires the work engineers.
_______ of the two boys went on a picnic yesterday. They _______ stayed home and watched the Omlypic games on TV.
He used to live five kilometers from school and ride a bicycle to school everyday. Last month his family moved to the school neighbourhood. He now walks to school. He_______ rides a bicycle to school.