The children all looked _______at the broken model plane and felt quite____.
–Who is the man ____ blue?–-My English teacher . He is strict _____ the students.
It is _________ difficult work that we can't finish it in a short time.
I still remember the village ________ I grew up.
Do you know if _______ back next week ? If he ________ back , please let me know .
The young trees should______ as often as possible.