Cathy is taking notes of the grammatical rules in class at Sunshine School, where she ______ English for a year. 

It is ten years since he _______ in this college.

He said that his friend ________there three days before, but she was not there_______.

---The window is dirty.----I know. It ______ for weeks.

A survey suggests that the royal wedding of Prince William and Kate Middleton _____ a great boost for British economy because a large number of visitors are expected to go.