This is _______ empty bottle. But it is _______useful one.
I couldn’t wait _____ the box as soon as I received the gift.
_____ of the students in our class _____ girls.
Don’t _____ your hands from the window when you are on a bus.
Maria has _____ trouble _____ math, so she often asks her math teacher for help.
Teachers should _____ their students to practice _____ English as much as possible.