—What do you usually do in your spare time? .        

—I usually _______ my friends homes.[ ]

A. come across        

B. pass by        

C. drop by        

D. look at

单侧唇裂术后继发唇红严重凹陷可采用（）

A.重新施行单侧唇裂修复术

B.唇组织瓣推进术

C.对偶三角瓣法

D.“V-Y”成形术

E.唇红再造术