Excuse me, Mr Li, I don’t know the meaning of the whole sentence. What shall I do?You should _____ .
Have you determined ___________?
---Can I help you? ---Yes, I bought this radio here yesterday, but it _____________.
He looked very confident and calm during the test, but __________ he was extremely nervous.
It was a cold winter night, and there wasn’t anyone __________the boy could turn for help in the street.
___________for his good skill, this doctor has a lot of visitors calling for help all the time.