Much attention must __________ English grammar.[ ]

A. be paid to learn

B. pay to learning

C. be paid to learning

D. paid to learn

维修作业时，尽量将手放置在自己（）范围内，养成作业前考虑是否存在碰撞、挤压风险的习惯和意识，避免手部乱摸、乱碰、乱放的不安全行为。