–Look at that girl! Is it Susan? --No, it _______ be her. She has gone back to her hometown.
—The food here is very nice. Thank you for inviting me. — _____ I’m glad you enjoyed it.
He made up his mind to devote his life _____ pollution ______ happily.
The players are passing the football from one to _____ in the football field.
_____ great progress he has made! I really think it’s _____ great success.
People in Yancheng are proud of ________ they have achieved in the past thirty years.