a. Complete the sentences with the words in the boxes.
 * The traffic policeman is working hard to ensure the safety of residents in my town.
   * ensure the safety: đảm bảo an toàn
 * My dad is a police officer. He is in charge of traffic and clear the jam.
   * in charge of: chịu trách nhiệm về
 * Rising rent costs in the urban area are causing a lot of difficulties for business owners.
   * owners: chủ sở hữu
 * Traffic jams dropped a lot because the city expanded the streets.
   * dropped: giảm
 * The drought lasted so long that it affected the corn crops in our village.
   * crops: vụ mùa
b. Complete the sentences with the correct forms of the words in brackets.
 * The park manager added more exercise equipment to attract more people to come and exercise here.
   * attract: thu hút
 * We are collecting food and blankets for the homeless.
   * homeless: người vô gia cư
 * The government plans to expand the lanes on certain streets to reduce congestion.
   * congestion: tình trạng tắc nghẽn
 * They are building more affordable houses to solve the problem of homelessness.
   * homelessness: tình trạng vô gia cư
 * Many people dream that they can own a home in an urban city one day.
   * own: sở hữu
c. Choose the correct options.
 * The city's public transportation system is so affordable that many residents prefer using it.
 * The population of the city is rising so quickly that there aren't enough jobs.
 * The environment is getting so polluted that we will have serious health problems.
 * The traffic jam was so serious that the city decided to widen streets.
 * Homelessness is such a serious problem that the city has to take action to solve it.
Giải thích:
 * So/such: Chúng ta dùng "so" trước tính từ và trạng từ ngắn, "such" trước danh từ. Cấu trúc thường gặp: "so + adj/adv + that" hoặc "such + (a/an) + adj + noun + that".
 * So quickly: diễn tả tốc độ tăng nhanh của dân số.
 * So serious: diễn tả mức độ nghiêm trọng của vấn đề ô nhiễm môi trường và tắc nghẽn giao thông.
 * Such a serious problem: nhấn mạnh tính nghiêm trọng của vấn đề vô gia cư.