1 . The old pictures bring the Greens to the days       they spent together,       life was hard but happy.

A．which; when

B．which; whose

C．when; whose

D．when; which

2 . I didn't become a serious climber until the fifth grade, _____ I went up to rescue a kite that was stuck in the branches of a tree.

A．when	B．where
C．which	D．why

3 . Between the two parts of the concert is an interval, ________ the audience can buy ice­cream.

A．when	B．where
C．that	D．which

4 . Between the two periods of classes is a break, _______ we can have a short rest.

A．then

B．where

C．when

D．which

5 . The book was written in 1946, ____ the education system has witnessed great changes.

A．when

B．during which

C．since then

D．since when

6 . Great changes have taken place in that school. It is no longer ___ it was 20 years ago, ___ it was so poorly equipped.

A．what, when

B．that, which

C．what, which

D．which, that