Ms．Zero was preparing food．Under one of the apple trees in the garden ______, smoking and looking at the harvest with a smile．

Some scientists believe that it won’t be long _______ robots are widely used in all walks of life．

 —Mary said Leo worked really hard.  — _______.

So much of interest ________ that most visitors run out of time before seeing it all.

(2013·江苏，27)“Never for a second，”the boy says，“________that my father would come to my rescue.”