David, _________ his father, _________ playing football.

regret _____ you that Tom failed to pass the driving test and that he really regretted ______ your advice on practicing more.

Some person calling for you at the gate.　　

Excuse me , haven’t you learned the new ___law Everyone in a car must wear the seat belt.—Sorry , we won’t do that again.

Mr. Robert is ________ our teacher. He is also ourfriend.