Finding information in today's world is easy.The ________ is how you can tell if the information you get is useful or not.
George once told me that he would visit our house,but,for various reasons,he ________so far.
Premier Li Keqiang delivered a speech at the conference, _________ university graduates to start their own business.
—What do you think of the Huawei P7?—Terrific, I would buy one if I ______ an iPhone 6 Plus last year.
______ worries me that my daughter plays with her cellphone for a long time every day.
—Has James arrived at the hotel?—No, he ______ by fans for photographs at the airport.