. It used to be thought _____ the Earth was flat.
【原创】Newspapers make a _____ from the advertisements they carry.
— I don't know how to spend my weekend. — _____
【原创】He has ____ hundreds of his paintings to the government.
【原创】Many scientists are still____about the value of the program.
【原创】When his friends heard my story, they _____ laughing.