Youcantakeanyseat____isfree.

Thetimehascome_____wemakeextensiveuseofnuclearenergy.

Let'sgoswimming,_______?

Theprimaryschool____(在孩提时代我在那里学习)hadverylittleequipment.

Itisobviousthatthisnewruleisapplicabletoeveryonewithout_____.