You know great changes _____________ in our school in the past ten years.
I bought _______ English-Chinese dictionary. _______ dictionary is very useful.
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.