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

The driver will be stopped at once if he or she is found _______ over the limited speed.

roblem is said _______ three times, but he stillcan’t understand it.

What do you think of the young lady — She is hard-working. She________ all her effort into her work before she got ill.

__ have worried before I came to the new school, for my classmates here are very friendly to me.