—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
. By the time I saw the angry expression on his face, I ____ what I was having to face.
. — I’m sorry that I shouldn’t have been so angry with you. — You ____ angry but that’s OK.
. Johnson had made up his mind to give it up, but on ____ second thoughts he determined to try ____ third time.
. What ____ great help the little girl is to her sick mother.
. Xiao Wang, ____ Smith is waiting for you at ____ school gate.