课时作业(五) [必修1 Unit 5 Nelson Mandela—a modern hero]
(限时：45分钟)
Ⅰ.单项填空
1．Whenever we are in ________ trouble, we should never lose ________ heart.
A．a; the B．a; a C．/；/ D．/; the
2．Principal White has been working in the school for about 20 years, ________all his energy to teaching and researching as well as the running of a healthy school.
A．devoted B．devoting
C．to devote D．and devote
3．With the money earned from the school garden, the students bought a blackboard, chairs and other things to ________ a “green classroom”．
A．pack up B．set up
C．add up D．come up
4．I can't say I'm the best. I have only ________ made more efforts than others.
A．definitely B．relatively
