从方框中选择合适的短语并用其适当形式填空

be good at; keep on; be sure about; grow up; try one’s best

【小题1】Mr Smith _________ working although he was tired.
【小题2】My sister is a writer. And she ________ writing stories.
【小题3】As a college student, I ________ my future.
【小题4】When we ________, our parents will grow old.
【小题5】Don’t worry. We will ________ to find out the truth.