I am writing to express my _______ for the safety of children travelling on school buses, especially those on high-risk and highway-speed routes.

These tables and desks are all made of＿＿＿＿＿．

Antarctica holds 90% of the world’s ice, and most of its fresh water (70%) is in a frozen          .

Is there any _____ for the piano in the office?

No one has yet discovered who is responsible for the incident but the police are already collecting ______．