一、根据句意及首字母或汉语提示完成句子
1．(2016·杭州)Linda stayed up late and p________ herself for the math exam last night.
2．Many ________ (观光者) were interested in the beauty of the lake.
3．We need to do lots of ________ (研究) to solve the problem.
4．He worked hard and a________ his plan in the end.
5．He tried again and again and s________ at last.
