Production at the factory was ______ for as long as 10 hours because the electricity supply was cut off.

________it is，the boy never seems to be able to finish it off.

It is not always easy for the public to see _______ use a new invention can be of to human life.

u have any idea why the engineer resigned—No In fact, everyone is ____about it

Jim is new here. so we know_____ about him.