1. The soldier lost his life when saving a child, so his
death
(died, dead, death) is heavier than Mount Tai.
2. We are amazed at the fast
development
(development, developing, developed) of our hometown.
3. We all hope to arrive at home
safely
(safe, safely, safety) after such a long journey.
4. A
sleeping bag
(schoolbag, sleeping bag, handbag) can help you stay warm at night.
5. It's
careless
(care, careful, careless) of you to leave your key on my desk.