--- Who are the teenagers gathering at the school gate? --- Well, if you _____ know, they are all my visiting students.
He invited me to a dance after the show Christmas Eve.
A great person is always putting others’ interests _________ his own.
You’d sound a lot more polite if you make a request ______ a question.
Modern equipment and no smoking are two of the things I like ____ working here.
Let’s learn to use the problem we are facing a stepping-stone to future success.