21. Nowadays it is difficult for people to find ________ work everywhere because ________ economic situation is very serious.
A. 不填；an B. a; the C. 不填; the D. a; 不填;
22. At weekends in Bengbu, you can often see many people ________ outside some restaurants, __________ to have dinners.
A. sit; wait B. seated; waiting C. seating; waiting D. sitting; wait
