Is that your best friend Kitty?— No, it _________ be her. She flew to Singapore yesterday.

 ——Can I get out in the daytime?——No. The school rules state that no child _____ be allowed out during the day, unless accompanied by an adult.

 –Look! A man is cutting a tree on the moon. --It ______ be true. The teacher said there is no air on the moon.

When Harry was at college, he ________ go to the reading room after supper every day.

We were looking for you all this morning. You    office without a word.