We'll have a picnic in the park this Sunday ____ it doesn't rain .
A. since
B. if
C. unless
D. until
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If you ______ to the party , you'll have a great time .
A. will go
B. went
C. go
D. going
He _____ a letter to his grandparents if he _______ hos report card this week.
A. write ; get
B. will write ;gets
C. writes ;will get
D. will write ;will get
If he ______ enough money , he ______ a science lab .
A. will have ; will build
B. have ;will build
C. has ;will build
D. has ;build
______ it rained hard , _____ the peasants still went on working in the field.
Although； /
Because ;so
C. Although ;but
D. Thought; but
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