—What's the matter with Della?—Well，her parents wouldn't allow her to go to the party，but she still ________.

Maria is constantly making efforts, she deserves          the goal of entering the key university.

It's clear that the thief was seen __ into the room that night.

Advertising is different from other forms of communication in that the advertiser pays for the message         .

I think you should think twice .Once ______, the decision won’t be easily changed .