_____ we have enough evidence, we can’t win the case.

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

(2013·江西，23)________ can be good at something for 40 years if he doesn't love it.

Clive Palmer，the designer of Titanic II，________to answer questions about the project's cost.

It's bad         for a man to smoke in the public places where smoking is not allowed.