Susan wanted to be independent of her parents. She tried ______alone, but she didn’t like it and moved back home.

We work together to achieve our common purpose: __________ world that is safer, cleaner and healthier than __________ one we are living in.

What did he _______ just now? —Sorry, I didn’t catch his words. I ­­­­_______ about something else.

Mr. Green ___ to the manager now. You’d better call him later.

Email is very popular today. People ______write letters to each other now.