-I saw Mark on the playground just now.–No, it _______ be him. He is ill in bed at home.
The elderly should _________ politely. Also, they must ___________ well.
My cousin has _______ Project Green Hope since two months ago.
This magazine ______ out _____ the morning of March 1st.
The old man was seen _______ in the park at 7:00 a.m. yesterday.
______ a host of the show is really ___________.