Mr. Green, a famous writer, ______ our school last month.

It’s very kind _____ you to help me carry the boxes since it is difficult ______ a person like you to carry so heavy things. [ ]

They are going to have a picnic _______ next week.

Do you know Tom?—Sure, we have ______in the same village for many years.

The book was written in 1946, ____the education system has witnessed great changes .