【单选题】You can’t help______commercials every few minutes a program is interrupted to broadcast one advertisement or another.
【单选题】The sunspot came into its active stage last year, that happens once every eleven years.
【简答题】Do you know there is an earthquake every thirty seconds in the world? But don’t worry because most of them are so small that they cannot be felt. Only a few hurt people. Many earthquakes happen in Chi...
【简答题】______________is required for every stage and at every level in the supply chain.
【单选题】I enjoyed every minute _______ stage.
【单选题】What does the man worry about?
【单选题】By upsetting the balance of the climax stage, man will ______ the indiscriminate hunting of whales for food.