“Why couldn’t they meet us at five o’clock?” “Because they were delayed by _________.”

A. heavy traffic       B. heavy traffics  C. crowded traffic       D. crowded traffics

“Why couldn’t they meet us at five o’clock?” “Because they were delayed by ________.”

A. heavy traffic      　    B. heavy traffics

C. crowded traffic      D. crowded traffics

—Why couldn’t they meet us at five o’clock?

—Because they were delayed by _________.

“Why couldn’t they meet us at five o’clock?” “Because they were delayed by ________.”

A. heavy traffic　　　　　　 B. heavy traffics

C. crowded traffic　　　　　 D. crowded traffics

---“Why couldn’t they meet us at five o’clock?”

---“Because they were delayed by ______.”

1. A.
   heavy traffic
2. B.
   heavy traffics
3. C.
   crowded traffic
4. D.
   crowded traffics