Helen and Mary are good friends. _______often help each other.

The principal is not here, and you’d better call him ______ 3 p.m. ______ 5 p.m. tomorrow. [ ]

Where is your mother? She_____________ Shanghai on business for a few days..

I have _____ finished my homework. What about you? –I finished it ______

I hear you’ll have _________ one-week holiday _________ next month. Is that right?