______ children believe they can succeed, they will never become totally confident．
#30571
A
If
B
Since
C
Once
D
Unless
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He made a promise ________he earned money, he would build a new school to help develop education.
#29981
A
what
B
that if
C
that
D
what if
I had been looking for the book for two days _______ I found it at last.
#30963
A
until
B
when
C
while
D
before
He will spend six hours at his desk _______ he finishes his composition.
#79623
A
before
B
until
C
after
D
when