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

Excuse me, sir. Would you please the total cost of the trip— All right, I will make it at once.

Though having lived abroad for years, many Chinese still ________ the traditional customs.[ ]

When the audience heard the alarm, they all hurried to they thought was an emergency exit door.

With all the tasks finished ahead of time, she felt a great weight her mind.