My sports shoes are _____ out.—How long have you_____them

nly the whole nation, but thewhole Europe , indeed the whole human society ______ to alter its attitude toracial problems.

Is this your pen —–____________.

“We give him a book.” The structure (结构) of sentence is .

John and I _____ friends for eight yearsWe first got to know each other at a Christmas partyBut we _____ each other a couple of times before that