When we start a new job, we try to hide our sense of loneliness by trying to

* Hướng dẫn giải

Đáp án là C. Ý trong bài: Your first day at work, or at a new school or university, is a typical situation in which you are likely to feel lonely.... The fact of the matter is that, in order to survive, we all put on a show of self-confidence to hide our uncertainties and doubts.