We ____ that the magazines you have borrowedbe returned to the school library before the end of this month．

Look! It ________be Mrs. Smith. —It _________be her. She has just gone to Shanghai.

Customs change from country to country. Some customs in China are quite different from in Western countries.

When is the Spring Festival this year—It’s______February 19th. But people celebrate it______the evening of February 18th ．

Are you going to Mary’s birthday party, Jack—I’d love to, but I _______ to come to her party.