Clean-Up Day is coming. How do we let more people know it?—We could ____ advertisements after school.

How glad we are! Miss Li will teach _______ English this term.

The train arrived _____ Nanjing _____ 6.00 _____the afternoon of Sep. 13. [ ]

___, I think, and the problems could be settled.

Look, Mr Green is on the other side of the street. — It _____ be him.He has gone to London on business.