Mingming will have a class meeting _______ 3:30 this afternoon.
on
in
at
We often see the sign in a hospital.
The Leaning Tower of Pisa (比萨斜塔) is so great _____ old building.
There is a big tree in ________ front of our classroom and a big blackboard_in ________front of it.
“Don’t ____ on the computer. It’s time for class.” Says my teacher.
Look. Mum with my aunt.