21. The tech industry expo, which attracted more than 180, 000 people, was a reminder of the tech industry is best at: being optimistic about itself.

A. that B. how C. what D. which 22. Time magazine has chosen "The Guardians"，a group of journalists who____ for their work, as Person of the Year, for taking great risks in pursuit of greater truths.

A. will target B. have targeted

C. will be targeted D. have been targeted

23. Being an experienced lecturer, Mr. Black____ his speech to suit a younger audience.

A. simplified B. addressed C. exchanged D. delivered

24. Bella, who is always cheerful, creates a friendly work atmosphere in her office every day,____ her colleagues find pleasant and relaxing.

A. where B. which C. when D. that

25. ---Can you help me with my English homework? You're a genius.

---__________, but I'll try to help you. What's your problem?

A. Far from it B. You bet C. By all means D. It's out of question

26. --- Were you busy last weekend?

--- Yes. Rather than ____ time playing cards as usual, I devoted every effort to ____ a delicious cheesecake.

A. waste; make B. waste; making C. to waste; make D. a waste of; making

27. The car burns more fuel, but all things ____ into consideration, it's still a good car.

A. taken B. having taken C. taking D. to take

28.They____with joy when they heard that their class won the first place in the relay race.

A. picked up B. split up C. took up D. sprang up

29.-What a pity! You missed my birthday party.

-Terribly sorry! ________ my uncle not visited me unexpectedly.

A. Should B. Would C. Had D. Did

30. -It's really great to have a computer to store my photos.

-Don't count on it too much. It ________ break down and you'd better make a copy of them.