1 . He began his career as a head football coach in 1969, _______ he was elected to lead the Oakland Raiders. (用适当的词填空)

2 . We will put off the picnic in the park until next week, ________ the weather may be better. (用适当的词填空)

3 . I can’t forget those days,________we played basketball together. (用适当的词填空)

4 . 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. (适当形式填空)

5 . It’s that time of the year again, ______ Apple fans go crazy about the coming of the new iPhone.

A．who	B．when
C．which	D．where

6 . My father retired in 2008, _____ he has been devoting his time to gardening.

A．at which	B．since when
C．when	D．after that

7 . 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

8 . My uncle arrived on a Wednesday,________ I was very busy.

A．which

B．where

C．when

D．why

9 . It was not until 1911, _______ the first vitamin was identified, _______ people realized the importance of it．

A．when; which

B．when; that

C．that; which

D．that; that