City planners have claimed trees (23) _______ important role in an urban environment. Children (24) _______ close to nature have better health, while walking in parks helps reduce blood pressure, stress and obesity. The problem is to select the right trees and maintain them. Ha Noi is considered one of the greenest cities in Vietnam thanks to its beautiful and precious trees. Ancient trees in Ha Noi are frequently (25) _______ in poems. Each street can be (26) _______ by a tree: when you speak about Nguyen Du Street, you are reminded of hoa sua trees, and walking on Tran Hung Dao, sau trees come to mind. To local residents, the hundred-year old trees that line the streets are more than just beautiful, they are part of the city’s identity. Due to the treasured place the trees have in the (27) _______ of the local residents, Hanoians seem to have a lot of concern when construction workers chop them (28) _______. Workers get away with digging around the trees without much care, and even leave the trees without enough earth to grow – making them vulnerable to storms. 23.A. act B. perform C. enjoy D. play 24.A. grow up B. grown up C. growing up D. grew up  25.A. referred B. indicated C. spoken D. mentioned 26.A. described B. represented C. expressed D. explained 27.A. brain B. place C. centre D. heart 28.A. down B. off C. away D. in