giúp mình với mọi người

9.B. Having waited for his friend to arrive, he answered emails on his phone.
10.The new policy is aim B. at boosting trade between Vietnam and China.
11.The Vietnamese government always D. prioritizes dealing with the domestic affairs.
12.They use special chemicals to B. accelerate the growth of crops.
13.It’s very difficult to C. integrate yourself into a society whose culture is so different from your own.
14.What did you do with B. the camera I lent you?
15.The crowd C. went bananas when their team scored the winning goal.