He is a ________ man—he always says what he thinks.

 Is Mr. Wang good at drawing his students into ________ discussion?

Make sure that the machine is kept where it is not ____ to children.

—Oh, Jesus, I can’t cut the durian into two halves however I tried!—Easy, boy! Why not use _______ knife?

Although the increase in the present sum used for the research is________， a great breakthrough could still be achieved by the end of this year.