Gun control is a subject ________Americans have argued for a long time.
It is hard for me to imagine what I would be doing today if I ________ in love, at the age of seven, with the Melinda Cox Library in my hometown.
Were it not for the snowy weather, we ________ all right.
________ more careful, his ship would not have sunk.
We ________ our lives had it not been for the policeman.
Wang Ling, one of my friends, is very good at English. He speaks English as if he ________ an Englishman.