He made another wonderful discovery, ____ of great importance to science.

       tomorrow, we will set sail for Canada.

Have you heard the news     a high-speed railway between Huangshan and Hangzhou will be under construction soon?

Can you still remember the farm          we enjoyed plenty of fresh fruit half a year ago?

      you must remain calm．

We’d say that never before       so moving a film as After Shock.

The World Expo 2010 is being held at a time        the world is looking for a new kind of balance between nature and cities．

Where is it ________ you picked up this watch?

Stephen Hawking has expressed his opinion   ___ humans might one day be able to make spaceships capable of such speeds that time on board would slow down．

The education reform plan took one year and nine months to draw up, _____ public opinions were called for,