新世纪,我国加快实施了一大批高科技工程,这是因为①世界各国之间的竞争越来越多地转向经济和科技领域②这些工程的实施能彻底遏制霸权主义和强权政治③这些工程的实施符合世界各国的利益④这些工程的实施有利于增强我国的综合国力,提高我国的国际地位
— I am leaving for the U.S. tomorrow, Caroline! — __________.
.The United States signed up Friday for the 2010 Shanghai World Expo,_______it the last major country to join the event.
.In this experiment, they are wakened several times during the night and asked to report what they__________.
--I hear Michael is in hospital. ----Oh, really? I____know. I______go and visit him.
Children find_____difficult to sit for hours with little to do while flying.