Answer:
What sevenยญletter word becomes longer when the third letter is removed?
What loses its head every morning only to get it back every night?
What object has keys that open no locks, space but no room, and you can enter but not go in?
In a year, there are 12 months. Seven months have 31 days. How many months have 28 days?
What instrument can make any sound and be heard but not touched or seen?
I am a room that has a roof but no walls. What am I?