1．(2019·北京高考)Earth Day, marked (mark) on 22 April, is an annual event aiming to raise public awareness about environmental protection.
2．(2019·天津高考改编)Most colleges now offer firstyear students a course specially designed_ (design) to help them succeed academically and personally.
3．(2018·浙江11月高考)Larger amounts of caffeine can cause a problem called (call) caffeinism.
4．The producer comes regularly to collect the cameras returned (return) to our shop for quality problems.
5．There was a puzzled look on her face because a puzzling problem puzzled her. (puzzle)
6．The manager was satisfied to see many new products developed (develop) after great effort.
7．With the couple working (work) in a nearby town, the house seems pretty empty most of the time.
