5.I don’t have to buy the lunch on campus today because my mother has prepared me a lunch box and a big apple in addition 15T
1.这个国家不大，但是在国际事务中它却发挥着重要作用。(play a role) This country is not big, but it plays an important role in international affairs.
2.正是在我叔叔的帮助下，我得以克服困难，按时完成了任务。(it is ? that)
It was with the help of my uncle that I overcame the difficulty and completed the assignment in time.
3.毕业时他决定留在北京，而他最好的朋友却选择了去西藏。(while)
While he decided to stay in Beijing upon graduation, his best friend chose to go to Tibet. 4.在这次校园英语演讲比赛中，我们班的玛丽获得了第三名。(come in) In this Campus English Speaking Contest, Mary from our class came in third. 5.你应该知道学习弹钢琴需要有时间，有金钱，还要有毅力。(as well as)
You should know that it takes time, money as well as perseverance to learn to play the piano.