6. Mrs. Smith locked both the front and the back doors before she went to bed ______ that someone might steal into the house at night.
A. so
B. for fear
C. unless
D. on condition

7. We have to wait for the bus, ______?
A. have we
B. haven’t we
C. do we 
D. don’t we

8. ______ the popularity of robots in Japan, the country’s robot-production growth is slowing down.
A. As
B. Although
C. With
D. Despite

9. The proposal deserves support as it gives ______ to the needs of children.
A. curiosity
B. awareness
C. priority
D. emphasis

10. Those familiar with evening dress will always ______ black with elegance.
A. link
B. associate
C. connect
D. relate