Many young people took part in _______ trees on Tree Planting Day.
Susan is my good friend and she always helps me _______ my Maths.
My mother often cooks delicious (美味的)food______ us.
We have lessons _____ 7.30 a.m ______ 11.30 a.m.
I like playing balls ______ basketball, football and pingpong.
---_______ is your uncle? --- He is a driver.