---You see there are a lot of cars and people on the street.-Yes it’s very.A. quietB.

问题补充：

---You see, there are a lot of cars and people on the street.

---Yes, it’s very.

A. quiet

B. long

C. busy

D. free

答案：

A. quiet

B. long

(答案→)C. busy

D. free

解析：根据句意街道上有许多车子和人，那么应该说交通是非常繁忙的，busy表示此意，故选C。