______ wind or rain, we always go to school on time.

Only when I left my parents for America ____ how much I loved them.

With the development of science and technology，there is no doubt ________ Chinese astronauts will land on the moon in the near future. 

As we grow up, it always _______ that after we give something up, we gain something new in its place.

John said he had been working in the office for an hour, _______ was true.