—Do you know ____ made him successful in his career?—Yes. His hard work and determination, of course.
In order to find ____better job, he decided to study _____second foreign language.
Do you think this shirt is too tight ____ the shoulders?
We ______ the difficulty together, but why didn’t you tell me?
______ at the door before you enter my room, please.
Our friendship _____ quickly over the weeks that followed.