When and where the accident ?—It happened on the street yesterday.

Shall we go for a picnic on Saturday or Sunday? — ______ is OK. I am free this weekend.

We’ll be back for our school’s ____anniversary ceremony(周年校庆).—I see. That means you’ll have a get-together with your classmates in_______ years.

It ____ over 10 years since my grandpa _______.

Jack is a student and studies at the NO.