1 : ___________ makes this restaurant so popular among locals?
A. Who                 B. Which                     C. What                   D. All are correct  
2 : I don't know ___________ is responsible for organizing the event.
A. whom                        B. who                     C. that                         D. whose
 3 : The duties of a nurse in a busy hospital may differ significantly from ______of a nurse working in a small clinic.
A. those                        B. that                         C. this                     D. these
4 : _______ opportunity presents a chance for growth and development.
A. These                      B. Those                    C. This                     D. It
 5 : Each lesson teaches you a pronunciation tip or vocabulary of a popular topic. _______ also gives many examples.
A. It                   B. This                  C. That                             D. They  
6 : The new technologies can help save time by predicting changes in traffic and warning people of possible traffic jams. _________ will also help cities operate more efficiently.
A. They                    B. It                 C. This               D. That
 7 : Humans are also responsible for the extinction of many species of plants and animals. ________is due to a number of factors.
A. It                     B. This                    C. They                    D. That
8 : Today more and more people are putting their lives at risk in an attempt to get the most shocking pictures to share on social media. ______ has had disastrous consequences.
A. That                           B. It                      C. This                    D. These
 9 : Write down the options, so you can review the advantages and disadvantages of each one. _________will help you see which option could be the best for you.
A. It                           B. These                        C. That             D. This
 10 : Most scientists express ________ that the cause of climate change is because of human activity.
A. their opinions         B. its opinions     C. his opinions         D. our opinions
11 : Forests also trap water during heavy rainfall and slow down the speed of water flowing into rivers. ________ helps to reduce flooding.
A. It                      B. This                     C. These                    D. They
12 : There's always ____________interesting happening at these events; you never know who you might meet or what you might see.
A. something            B. anything               C. everything               D. nothing
13 : They found ___________lost in the maze of streets in the unfamiliar city.
A. them                      B. their                     C. theirs               D. themselves  
14 : She managed to finish the project without___________, despite his absence.
A. his                          B. her                          C. him                     D. them
15 : Completing this project on time is not merely a matter of__________; it impacts the entire team's reputation.
A. ours                      B. us                   C. our                         D. we