I       sight of an empty seat at the back of the bus and went directly there. 

The leader of the factory told us that very little ______ was made of the waste material in the past.

(2013 ·陕西宝鸡二模)—You don't seem to be quite yourself today.What's wrong?—Oh, I'm suffering from a cold.Nothing serious ________.

— What does Mary do?    — Her job ________ helping old people who live alone.

 I would appreciate ______, to be frank, if my computer could be fixed as soon as possible.