— Someone is knocking at the door. Is it Ann?— It _____ be her. She is giving a performance at the theatre now.
I find it very hard ____ the question.
When the teacher came into the classroom, the students _______.
This is such an _________ story that we` re ___________ in it.
Lucy is a____ girl from America.
_________ very important for her to work hard in all her subjects.