—Try to have a healthy lifestyle. It can help you get good .— Thanks I’ll do. A. classes

问题补充：

—Try to have a healthy lifestyle. It can help you get good .

— Thanks, I’ll do.

A. classes

B. grades

C. gifts

D. grasses

答案：

A. classes

(答案→)B. grades

C. gifts

D. grasses

解析：get good grades为 固定词组搭配，表示取得好成绩的意思。故选B