So hard_ in the past few months that he has made great progress in English—I can see that, only a few mistakes _____ in this exam

Many audiences listened to his speech very attentively from the very beginning to the end, my parents ___________.

Where are__________ pens—Are__________ in the pencil box

No one imagined that the apparently _____businessman was really a criminal.

Do you know that the meeting _____ this afternoon has been cancelled? — No. Thanks for telling me. [ ]