The man is optimistic ________ his life and doesn’t ________ at all.

A. about；lose heart 　　　　　　　　　　　　　 B. about；lose his heart

C. on；lose heart 　　　　　　　　　　　　　　　 D. of；lose hearts

_____ and you will be in hell; Keep up and you will be in paradise.

　 A. Lose heart　 B. Lose your heart　 C. Losing heart D. Losing your heart

In order not to _______, he spent the whole night preparing for the speech of next day.

A.lose courage　　　　　 B. lose heart　　　　 C. lose face　　 D. lose voice

---Don’t you think the new job is a real challenge for Jack?　

---Well, 　　 difficulties he meets, I believe he will never lose heart.

　 A. whatever　 　　 B. however　　 C. whichever　　　 D. whenever