(2013·北京，27)Many countries are now setting up national parks________animals and plants can be protected.
A．when B．which C．whose D．where
Time is of no importance to great thoughts，________ are as fresh today as when they first passed through thinkers' minds ages ago.
A．what B．that C．which D．where
Now there is just one point ________ I wish you to make quite clear.
A．where B．which C．whether D．when
It's helpful to put children in a situation ________ they can see themselves differently.
A．that B．when C．which D．where
—What do you think of teaching，Bob?
—I find it fun and challenging.It is a job ________ you are doing something serious but interesting.
A．where B．which C．when D．that
The weather turned out to be very good，________ was more than we could expect.
A．what B．which C．that D．it
