21. Whenever we are in_________trouble, we should never lose_________heart.
A. a; the B. a; aC. /; /D. /; the
22. Stella wonders_________the police have the information they need to find her bag.
A. that B. which C. what D. whether
23. I have made_________clear that all of us are strongly against smoking in the office.
A. this B. that C. it D. one
24. We’ve made our plans, and now we must put them into _________.
A. fact B. practice C. reality D. deed