-Hello! Is Mr. John in the office?-Yes. But I'm sorry. He is busy __________ and can't speak to you.
My iPhone isn’t in my bag.Where ____ I have put it?
____ you start eating in a healthier way, weight control will become much easier.
She wishes she ___to the cinema last night.
The old scientist used to say that knowledge ______ from practice.
A person _____e-mail account is full won’t be able to send or receive any e-mails.