I won’t be able to understand what you say ______you speak too quickly.
Because of the ______ snow, the birds could not _______ anything to eat.
These clothes look very nice ______ you.
—Be careful not to _______ anything behind. —Thanks. I have everything in my bag.
There are about _______ students in their school now..
The nature reserve is a good place _______ wild animals ____ live ___.