随堂演练及时体验 巩固提升 ⅰ.选词填空 1．by design, by chance ①he didn't do that on purpose. it happened ________. ②this doesn't happen by accident; it happens ________. 答案 ①by chance ②by design 2．straight, direct, directly ①keep the boat in a ________ line. ②the plane goes ________ from beijing to qingdao.
