Watch out for these animals! They could be terrified ______ a sudden loud noise.

—She looks very happy. She ______ have passed the exam.--I guess so. It’s not difficult after all.

Although this ____ sound like a simple task, great care is needed.

It is usually warm in Autumn here. But it _____ be freezing sometimes. 

Grace doesn’t want to move to New York because she thinks if she _____there ,she wouldn’t be able to see her parents very often.