practice或exercise或train 作动词用就是practice,指练习做某事,+doing 作名词就是exercise,指一次练习, train指让某人练习,train sb to do sth train还可以加ing后缀变为名词,等于exercise(train还有名词的意思,译为“火车”)
1. mainly这里要用副词 2. educate 这里要用动词 3. interview 这里要用名词,因为前面有the spend time in doing my work, 或spend time on my work. many people have eye problems. 因为这里many people作主语 used to 表示”过去常常。。。。“