1. We regret to inform you that there are no tickets ______ for Friday’s performance.
A. accessible B. acceptable C. available D. suitable
2. —My Goodness! Somebody ______ my umbrella.
—Don’t worry. You can share mine.
A. took B. has taken C. had taken D. is taking
3. The number of smokers, ______ is reported, has dropped by 17 percent in just one year.
A. it B. which C. what D. as
4. Not until recently ______ the development of tourist-related activities in the rural areas.
A. they had encouraged B. had they encouraged
C. did they encourage D. they encourage
