--Look! The telephone is broken. Someone damaged it ________ purpose. --That may be right. But perhaps it was broken _________ accident.
She was so angry that she rushed out into the rain ______ I could stop her.
While listening to the concert, the audience is required to remain ______ and keep quiet.
It is important to know about the cultural differences that______ cause problems.
In classes, you’d better understand as much as possible while ______ notes.
Thank you for all your hard work last week. I don’t think we ______ it without you.