Remember never to leave your dog ______. It might bite people around.
The Great Wall is so good a place ________ many foreign people come to visit ________ it has become well known all over the world.
The college students must study hard to a good knowledge of advanced information technology.
His grandmother likes finding fault ________ others who talk with her ________ the spot.
The view________many scientists hold is________too much emission (排放)of carbon dioxide is destructive.
Then came a terrible thunder ________ the sudden lightning.