.Come and see me whenever_________.
What would happen to the earth if the sun suddenly switch off some day?
Despite its little nutrition, the instant noodle is delicious and a hunger killer, so it__________since its birth.
Distance education programs the disadvantages of limited time, distance or physical disability, so they are becoming more and more popular all over the world.
A New York couple have been killed in a car crash on their way to hospital,but the unborn baby________ the accident.
________that the government can clear up official corruption,we are________ about the future of our country.