Great changes have taken place in Homg Kong ______1997
A. since
B. once
C. when
D. until
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It has been three months _______ he moved to this school.
A. since
B. once
C. when
D. until
They _______ friends since they met in Shanghai
A. haven't been
B. have been
C. aren't
D. are
We'll have a picnic in the park this Sunday ____ it doesn't rain .
A. since
B. if
C. unless
D. until
If you ______ to the party , you'll have a great time .
A. will go
B. went
C. go
D. going
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