II. Choose the best answer A, B, C or D to complete the sentences.

6. Using a smartphone, you can keep fit with health and fitness _______ to track miles walked and the calories you have consumed.

A. appliances B. apps C. devices D. equipment

7. People join and volunteer _______ they believe the cause is right, and this is the highest level of motivation.

A. or B. because C. so D. but

8. The boat rudder was first invented to steer large ships which _______ the Chinese to build huge ships as early as 200 AD.

A. made B. let C. enabled D. kept

9. The Tesla Coil is used _______ extremely powerful electrical fields.

A. to create B. to solve C. to offer D. to permit

10. As a volunteer, you participate in helping our society ___ the needs of people from all walks of life.

A. require B. meet C. see D. catch

11. Remote patient-monitoring technology _______ treatments quickly without requiring the patient to visit the hospital in person.

A. states B. suggests C. expresses D. indicates

12. Apple _______ over 1 billion iPhones globally since the first generation in 2007.

A. sells B. sold C. has already sold D. have already sold

13. Bio-artificial liver device ______ hope to all those who _______ from extreme liver failure since its introduction.

A. give - is suffering B. has given - are suffering

C. gives - suffers D. are giving - are suffering

14. 3-D printing is used _______ complex tools and components.

A. bring out B. to bring out C. produce D. to produce

15. Artificial intelligence has always been used for making smarter business decisions.

A. bringing B. taking C. doing D. making