用所给动词的适当时态填空.
George______(be)in business since he graduated from collage.
We______(learn)three thousand English words by the end of last term.
The sheep______(disappear) one after another since last month.
The Olmpic Games______(take)place twenty-nine tines since 1896.
Mr Li didn't go to the cinema because he ______(see)the film brfore.
The government______(make) traffic laws to stop accidents recently.
I______(read)The AdventurES of Tom Sawyer these days.
Don't worry.The work______(finish)already.
Peter's mother______(tell)that her son______(apologize)to Mr Brown already for breaking his window.