Many teenagers the old and they often offer their seats to the old on buses.A. agree with

问题补充：

Many teenagers the old and they often offer their seats to the old on buses.

A. agree with

B. worry about

C. laugh at

D. care for

答案：

A. agree with

B. worry about

C. laugh at

(答案→)D. care for

解析：句意：许多年轻人关心老人，并且经常给他们在公交车上让座。agree with sb意为“同意某人的观点”；worry about意为“担心，担忧”；laugh at sb意为“嘲笑某人”；故选D。