Experiments of this kind __________ in both the U. S. and Europe well before the Second World War.
.Beijing expects China’s rich civilizations to ________ the world with a happy surprise at the opening ceremony of the 2010 Shanghai EXPO.
.. ---All the building materials have been washed away.---So I have heard. But there was no sign ______ a heavy rain was on the way last night.
.The sale usually takes place outside the house, with the audience ______ on benches, chairs or boxes.
.In the UK, what impressed exchange students most was the Student Activity, ____ they could get lots of information outside.
.Nobody could have guessed, in those days, the place in history that Martin Luther King, Jr ____.