How often do you clean your classroom? —_________．

He must be ______ home now. [ ]

There are many tall trees on ______ side of the street.

When can I come here for the photos? I really need them tomorrow afternoon. —They _______ be ready by 12:00.

(2013·南昌一中月考)Thousands of visitors were ________ to the Xi’an International Horticultural Exposition the day it opened.