She is late. What _____have happened to her? A should B must C can D would
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.