1.As a student,you are expected to focus your energy your study.
答案on
2.The concert by the famous singer was failure,which was beyond expectation.
答案a
3.Mary was away in Paris over a week.When he got home,there was a pile of mails (wait) for him.
答案waiting
4.The boy hurried to the school,only (find) it was Sunday.
答案to find
