I need answers yall this is all I have and it makes no sence

What was the first official pair of sister cities?

Which of the following events did not occur as a result of china’s open-door policy? a. trade between japan and china was encouraged. b. all countries were given equal access to chinese ports. c. foreign influence in china increased. d. the influence of the communist party weakened.

Which is not a cash crop grown in the high islands of melanesia and polynesia? d. rubber c. coffee b. sugar cane a. kiwifruit