I.
1. locked
2. dangerous
3. community
4. safety
5. suitable
II.
1. How
2. ice cream
3. like
4. fruits
5. matter
6. the
7. help
8. starts
9. forward
10. of
III.
1. have to
2. must
3. have to
4. have to
5. must
IV.
1. I go to school by myself every day.
2. Let's go out tonight for dinner.
3. There is a wardrobe in the right side of the room.
4. You must obey your parent's advice.
5. The boss asks me to meet him at the restaurant.