請幫我解決下英語謎題1Have you heard the saying:what goes up must come

題目：

請幫我解決下英語謎題
1Have you heard the saying:what goes up must come down Well what goes up and never goes down?( )
2 What has a face but no head ( )
3What has legs but can't walk?( )

解答：

sun age
clock
chai