The two top students in Mr. Green’s class competed _____ each other for the highest marks.
They consider that vase to be a treasure, but in my opinion, it is just a ______ bottle.
At last, they came to a beautiful island, _____ they enjoyed a good picnic.
He is the man _________ you can turn when you are in trouble.
—How are you getting along with your studies?—Not very well, ______.
Whenever we’re in ________, we should never lose ______ but try to think of the way out.