One day， _____，Newton saw an apple fall from a tree.

It’s time to say goodbye to my school.I’ll always remember the people have helped me.

My cousin likes dressing up _____ a monkey.[ ]

It worried her a bit _____________ her hair was turning grey.

I phoned you at 7:00 this morning. But there was no answer.—Well, maybe I _________ morning exercises at that time.